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0d. 22, 1946.
2,409,923
A. BARNES ET AL '
PROCESS OF FORMING IODINE IMAGES
Filed Jan. 12,- 1944
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In yen for;
ART/I01? BAR/V5.9
l/ELHV R Ill/SEA’
39a ?ilorney
5%
2,409,923
Patented Oct. 22, 1946
UNITED‘ STATES PATENT OFFICE
2,409,923
PROCESS OF FORMING IODINE'IMAGES
Arthur Barnes, Waltham, and Helen’ P. Husek,
Allston, Mass, assignors to Polaroid Corpora
tion, Cambridge, Mass, a‘corporation of Dela-l
ware
Application January 12, 1944, Serial No. 517,982
54 Claims.
1
(Cl. 95—88)
2
This invention relates to methods of forming
images of materials, such as iodine, which plane
polarize light when supported by, or suspended
in, a suitable molecularly oriented plastic carrier,
and to methods of producing said images in such
carriers.
It is oneobject of the present invention to pro
vide'a novel ‘method of producing images whose
,
This invention contemplates the production of
V a predetermined image, or the like, by the trans
formation of a portion of at least the surface area
of a non-polarizing material to a polarizing sur
face, whereby said image is obtained in polarized
light. In accordance with the invention an emul
sion of a photosensitive material, such as a silver
halide, is exposed and developed, aswell under
stood, in the art, toform an image in silver and is
contrast is a function of the direction of vibra
tion of incident light, which images are known as 10 thereafter subjected to a novel chemical trans
“vectographs” and, more speci?cally, to provide
vectographs which are reproductions of photo
formation whereby the silver image is converted
into a corresponding iodine image.
,
'
There is illustrated by way of examplein the
graphic images.
Another object of the invention. is to provide a
drawing one form of sheet material for carrying
novel method of so transforming an image pro
15 out the method of the invention in which the
duced by exposing and developing a photosensi
silver image [0 is formed in an emulsion wherein
the suspending agent for the silver particles con
sists of a, sheet or layer l2 of oriented plastic,
which plastic is of such character that iodine
tive emulsion as to produce a corresponding image
in a dichroic material.
,.
,
> It is a further object of the invention to pro
vide a novel method of chemically transforming 20 is adapted to produce therein a light-polarizing
stain. In another form of the invention the
an image in silver to an image in iodine.
oriented plastic sheet, instead of forming part
Further objects of the invention are the pro
of the photosensitive emulsion from which the
vision of a method of conventionally exposing
silver image is obtained, may constitute a base or
and developing a silver halide emulsion and
a support for a conventional silver halide emul
thereafter subjecting said emulsion to a plurality
sion, as for example of gelatin. In still another
of novel chemical transformations whereby iodine
form of the invention the silver halide emulsion
replaces the exposed silver halide particles of the
may comprise a suspension of the photosensitive
original emulsion; the provision'of a novel meth—
material in a mixture of gelatin and polyvinyl al
0d of effecting the desired chemical transforma
tion from silver to iodine whereby the iodine im 30 ‘cohol. lEt is also to "be understood that other
transformations of silver to iodine are within the
age is substantially as sharply and as clearly de
scope of the invention, as for example, a positive
?ned in the carrier as the original silver image;
print in silver may have the silver image conthe provision of a novel photosensitive emulsion
verted to an iodine image, in accordance with
comprising a silver halide in a molecularly
the processes of. the invention, and the latter may
oriented I plastic carrier, which carrier when
then be imprinted by a suitable transfer process
stained with iodine, is adapted to render‘ said
on a sheet of oriented plastic to produce in said
stain dichroic; the use of an oriented sheet of
sheet a dichroic image which will correspond to
polyvinyl alcohol surfaced with a conventional
silver halide‘ emulsion, as'for example, of gelatin,
in‘ carrying out the novel transformation of the
the
silver
image;
,
'
'
I
.
In the preferred embodiments of the present
invention, the molecularly oriented carrier in
invention to obtain a corresponding dichroic im
which the dichroic image is formed is a sheet of
age; and the provision of a novel method of ob
transparent, high molecular weight polymer
taining an iodine image in anrunoriented mate
adapted to form a dichroic sorption complex with
rial and of transferring said image to a molecu
larly oriented plastic carrier, as by a surface-to 45 iodine,'said polymer preferably containing‘hy
droxyl groups, and examples of suitable polymers
surface contact, for the purpose ‘of producing a
are polyvinyl alcohol, partially hydrolyzed poly
corresponding dichroic image in ‘said ‘carrier.
vinyl acetals and polyvinyl alcohol esters, and re
generated cellulose; Of the materials falling
obvious and will in part appear hereinafter.
The invention, accordingly, comprises the ‘sev 50 within. this class'the preferred material is poly
vinyl alcohol and images formed in properly pre
eral steps and relation of one of said steps with
pared
sheets of thatmaterial possess the highest
respect to each of the others, which are exempli
dichroism and hence are more suitable in the pro
?ed in the following disclosure and the scope of
duction of dichroic images.
the application of which willbevindicated in the
In order to obtain the best results with respect
~ Other objects of the invention will in part be
claims.
"
1‘
‘
I
a
l
1
'
2,409,923
3
4
to dichroism in the images of the present inven
iodine images formed from said silver images,
provided with a pair of suitably oriented analyz
tion, at least the surface molecules of the plastic
carrier should ?rst be oriented to substantial par
ers, may have only the left eye image rendered
allelism. This may be conveniently accomplished
visible to his left eye and only the right eye image
by softening the sheet, as for example by subject 1:: to his right eye, whereby the object is seen stereo
scopically.
ing to heat and then stretching or extending the
In one embodiment of the invention a silver
sheet until suitable orientation of the molecules
halide emulsion in polyvinyl alcohol is exposed
has been obtained. In the case of polyvinyl alco
and developed by conventional photographic
hol, a sheet formed by casting may be placed in
satisfactory condition for the formation of di
methods to produce an image in silver in the poly
chroic images therein by subjecting the sheet to
mechanical stress, as for example, by stretching
vinyl alcohol, and the silver image is thereafter
in a uniform direction until the ‘molecules there
in are sufficiently oriented. A~ ‘stretch of from two
to six times the original length 'of the sheet pro
duces good result. Alternatively, the surface mol
in turn is converted to an image formed of an
transformed to a silver ferrocyanide image, which
oxidizing agent, the latter being adapted to re
lease iodine fromi'an iodide. The polyvinyl alco
hol suspension 'of' the oxidizingagent is then re
acted in an iodide and a material adapted to dis
ecules of a sheet of polyvinyl alcohol. may be
solve said agent, thereby releasing iodine from the
oriented, as by application of linear frictional
force thereto, without orienting the molecules‘
throughout the remainder of the sheet.
Where an image
polarized light is, to be
formed in a molecular-1y oriented plastic carrier
iodide. As a result of this transformation, the
iodine is physically located at the same points on
the exposed" surface as the‘ original exposed silver
halide particI'esPand forms the desired dichroic
image in'the polyvinylral'coholr
‘by a chemical transformation of a silver image in
_
Totransform the silver to silver ferrocyanide,
‘said carrier to- an iodine image, the plastic carrier
the suspension of silver in‘ polyvinyl alcohol is
is 'preferabiy' onewhieh maintains its orientation
and-is stablethroughout the steps comprising the
bleached by a suitable ferricyanide, for example,
potassium ferricyanide, sodium ferricyanide, or
novel process of the invention and which-is ca
, ammonium ferricyanide. The silver ferrocyanide
pable of sup-porting a dispersion of the photosen
sitive- material from which the silver image‘ is
thus obtained‘ is then reactedwith the salt of a
fort-node.v Polyvinyl- ~alcoho1 is a preferred mate 30 polyvalent metal, which is in its higher valence
‘rial for ithe'plastic carrier for the further reasons
form and which forms with the ‘silver ferro
cyanide a water-insoluble metallic ferrocyanide.
that it is stable in, and is permeable by, thesolu
tions which convert and transform the silver hal
Examples of suitable salts for this. step are the
ideitoa silver ‘image and vthe silver image to the
ultimate dichroic stain of iodine. Polyvinyl alco
cupric and ferric salts, such as cupric chloride,
cupric sulfate, ferric: chloride, ferric sulfate, and
hol is also relatively insoluble in said-solutions so
ferric ammonium sulfate- The silver salts which
are in the emulsion at the completion of this
reaction are preferably removed,’ as by washing in
a. relatively weak ‘solution of sodium thio-sulfate.
‘that ‘a sharp dichroic image is obtained, despite
the"several‘transformations which constitute the
novel process- of the invention.
The plastic carrierin any of vthe processes com.
40
prehended by the present invention may be sup
ported in a sheet M ‘of a transparent plastic, as
‘for example a ‘cellulo'sic plastic, such as cellulose
acetate ‘and‘cellulose nitrate, or a vinyl com
pound, such as the vinyl acetals, vinyl acetate, ~
vinyl chloride, the vinyl acetate-vinyl chloride
‘copolymers, or a condensation type superpolymer,
To produce the. iodine i1nage,. the water-insol
uble metallic ferrocyanide, which. is‘ the product
of the last reaction, is transformed to its corre
sponding watery-insoluble hydroxide by reaction
with a. suitable base, such as sodium or potassium
hydroxide. The metallic hydroxide is then re
acted With an iodide in. the presence of an acid, as
for example an acid solution of the iodide, to re~
such as: apolyamide or nylon type plastic. Cellu
{use acetate is a preferred material for the sup
port and “to form the ‘most satisfactory material I
for the'dichroic image there is bonded to‘at least
.oneface of alsheet of said acetate, a sheet of mo
lease iodine which replaces the hydroxide and
forms ‘the image in the polyvinyl alcohol. Exam
ples of suitable iodides for this step are sodium
iodide, potassium iodidev and ammonium iodide,
lecularly oriented polyvinyl alcohol having a hy
‘d'roxylconten-t, preferably in excess of 50 %, said
‘large number of'aci'ds, of which hydrochloric, sul
phuric and maleic ‘acids-are preferred examples.
polyvinyl ‘alcohol sheet beingiuniformly oriented .
‘throughout its entire thickness.
,
r
.
and these may vbe usedri-n solution with any of a
. In the-‘above process the transformation: of sil
ver. to silver ferrocyanide ‘and the conversion’ of
the silver ferro'cyanide to the ferrocyanide‘sa'lt of
.
‘ v‘The following. description of the invention is
given: by way of example in connection with a
arpo'lyvalent metal in its high valence form,.have
material having an oriented carrier provided with
been described as two distinct operations and may
a. silver image on only one surface thereof where
by asmgle image in polarized light is obtained in
vthe final product. It is to be expressly under
stood, however, ‘that the process is equally appli
cable to the formation of dichroic images on a
‘material having both of. its faces molecularly ori
ented'and constituting part of, or supporting on,
both of its-oriented, faces, silver suspensions pro-
vidihgfdesired images, The‘ imagesmay beof the
same object andmay bear arpredetermined rela
tion to 'one‘another. For example, one'may be the
left’eye. image and the other the right eye. image
of a; ‘stereoscopic pair and the directions of the
molecular orientations‘of the plastic layers carry
ing said images may be at substantially-‘right
‘angles to one another: so. that i an observerof . the
be; carried out. in‘ separate solutions. However,
the conversion'of: silver to the metallic ferrocya
nidemaybe carried out more rapidly by effecting
the‘tra‘nsformation in a single solution containing
both reactants, i. e., the ferricyanide and the me:
l-tallic salt. If the reactions are carried out in this
preferred manner, 1. e., in a singlesolutiompre
v
cautions are taken to prevent direct reaction of
the. metallic salt and the ferricyanide. This may
be accomplished by the addition to the solution
of a suitable composition comprising an organic
salt, such ‘as, ammonium oxalatayand an acid,
suchas oxalic» acid, the llatter'acting also as an
‘accelerator: Other materials which, may be-used
instead of-amm'onium oxalate for preventing un
75 desired interaction between the components of
60
2,409,923
5
the .solution are, for example, potassium oxalate,
6
which event the image is formed in silver chro
mate, which is also insoluble in water and acts
as-an oxidizing agent. However, in the last
sodium tartrate, ammonium tartrate, sodium suc
named modi?cation of the process, because the
cinnate and other organic salts. Instead of oxalic
acid, other acids, such as hydrochloric acid and 5 insoluble image is-formed of a ‘silver salt, the
release of iodine is accompanied by the, forma
weak alkalies, for example, sodium carbonate, po
tion of, an insoluble secondary image. Accorde
tassium carbonate and ammonium carbonate,
ingly, said method is useful primarily in connec
may be used.
'
tion with methods wherein the iodine image after
It will now be apparent to those skilled in the
art that the above method of transforming a 10 formation, or as it is formed, is transferred to
a molecularly oriented plastic sheet.
silver image to an iodine image will render un
It is to be understood that the invention‘ ‘com
necessary the stopping and fixing of the silver
prehends any process wherein a silver image'is
image produced by developing the exposed silver transformed or converted by suitable reaction to
halide-polyvinyl alcohol emulsion, so that one
or. both of these operations may be eliminated. 15 an image comprising a compound which releases
iodine from an iodide in a solution containing
It is preferable, however, to perform at least
a solvent for said compound, such for example,
thestopping by conventional methods. The en
as an acid.
’
"
‘
’
tire operation after the stopping can be carried
The following examples of the novel processes
out in daylight, without affecting the quality of
the ?nal product. It is preferable also to wash 20 of the present invention are given for purposes
of illustration, but it is to be expressly under
the print after each operation which follows the
stood‘ that the proportions may be varied within
removal of the silver salts from the emulsion.
wide ranges and that the ingredients may also
The above process can be readily adapted for
be varied as speci?ed hereinabove and as will now
transforming the silver image of a conventional
photographic paper print to an iodine image, 25 be apparent to those skilled in the art.
potassium citrate, ‘ammonium citrate, potassium
which iodine image can then be transferred to a
Example 1
sheet comprising at least a surface layer of mo
lecularly oriented polyvinyl alcohol. In a pre
A layer or sheet of‘ molecularly oriented poly-v
ferred adaptation of the transfer process, the
30
vinyl
alcohol containing, or supporting, a silver
iodine is not released until the paper print is
halide emulsion and mounted, on a suitable sup
brought into intimate contact with the polyvinyl
porting sheet of cellulose acetate, is exposed, de
veloped, and stopped, in accordance with‘ conven
tional photographic methods. It is preferably
alcohol surface. This modification of the process
comprises transforming the silver image in the
paper print to a hydroxide of a polyvalent metal
in its higher valence form, as described above, 35 washed in water and is then immersed in a bath
consisting of:
1
and then immersing the print in a solution of
c. c.
an iodide which does not contain an acid.
This
Ammonium oxalate, saturated solution_-___ 100
brings the iodide into intimate contact with the
Cupric sulfate, ten per cent solution____.____ 20
hydroxide image but because of the absence of
‘
the acid does not release iodine. The acid for 40 Potassium ferricyanide, ten per 'cent solu‘
tion _________________________________ __
l5
rendering the metallic hydroxide capable of ef
Oxalic acid, saturated solution ____ _‘______'__ '5
fecting the release of the free iodine from the
iodide solution is contained in the oriented poly
The bath is preferably prepared by mixingrthre
. vinyl alcohol surface with which the print is 45 ingredients in the order in which they are named
then brought into surface contact. The iodine
and is maintained at approximately room tem
is thus simultaneously released and transferred
perature. The time required for this step of
to the polyvinyl alcohol surface. The acid, as
the process is not critical since reactions to com
for example maleic acid, may be introduced into
pletion are involved, immersion fortwo minutes
the polyvinyl alcohol surface in any well known
manner, as by casting the polyvinyl alcohol layer 50 or more giving good results.
The print is then washed in a 5% sodium thio
or sheet with the acid contained in the casting
sulfate
solution to remove the silver salts, and
solution. Where this transfer method of obtain
then
with
water. It is immersed ina 1.5% solu
ing dichroic images is used, it is unnecessary to
wash out the silver salts after the metallic fer
rocyanide image is formed.
tion of sodium hydroxide for several secondsland
55 is then washed in water and placed in an acid
solution of potassium iodide comprising:
' An alternative method of transforming a silver
0. 0.
image to an iodine image, in accordancevwith
the present invention,‘ is to react the silver with
Potassium iodide, .ten per cent solution___-_ v100
a solution of a permanganate, as for example
Hydrochloric acid, N solution ____________ __
potassium or sodium permanganate, to form an 60
image comprising the relatively insoluble man
ganese dioxide. The latter serves to release
iodine from an acid solution of an iodide in much
the same manner as the ferric hydroxide in the
65
foregoing examples releases iodine.
"
, Still another method is to react the silver image "
20
The product of this immersion contains an
‘image in iodine.‘ It is preferable to immerse the
print in a ?nal ?xing bath, which bath contains
boric acid to stabilize the dichroic‘ image? The
fixing bath may also contain sodium sulfate to
prevent softening of the sheet,- potassium iodide
to provide a control for the color of the image
with a solution containing a bichromate, such
as potassium or sodium bichromate, and a metal
and in some instancesa weak solution of sodium
lic salt, such as lead nitrate, which will form
thiosulfate.
as a product of the reaction an insoluble metal 70
Example 2
chromate. v'I'he reaction, when lead nitrate is '
used, gives an image comprising lead chromate
which acts in an acid solution of iodide to release
iodine. A modi?cation of this method is the
use of a bichromate without the metallic salt, in
M The processis carried out in the same manner
and with the same materials as that of Example
75 '1,‘ except that the silver image is "transforqmedjtd
“2,409,923
7
8
a ferric ferrocyanide instead of a cupric ferro
1% solution of nitric acid, by immersion. in said
acid for approximately two minutes. The print
cyanide image by a solution consisting of:
.
.
.
.
.
_
.‘c_
Iron alum, ten ‘per Cent!‘SO1utiQn'__;;;;-__--
may be washed again and is then dipped in a
c_
5.0
neutral 10% potassium iodide vsolution. There
after, a sheet comprising an outer layer of molec
Potassium ferricyanide, ten per cent solu
oxalic acid, saturated sol tion_-;-_ '_
Ammonium alum, saturated solution:
ularly oriented polyvinyl alcohol, containing
approximately 10% by weight ofmaleic acid, is
._- 12'
_ .20
brought into contact with said print whereby
- ydrochlor-ic acid, N solutions_>r_____-_
a
3.0
Wateri._'__-__~_._____________ __‘;_g_'_;____._-_ 180
iodine is released and is transferred to said sheet
to give the desired dichroic image.
Example 6
and the iodine is released ‘in a solution of potas
sium iodide comprising:
'
'
‘
'
.
A paper print is immersed for about two min
utes in a bleaching solution consisting of:
c. 0.
Potassium iodide, ten per cent solution_'___-_ 100 15
Hydrochloric acid, N solution ____________ __
'
c. c.
Potassium permanganate, five per cent solu
30
tion ___________________ _'_ _________ __,w____
Example 3
6
Water __________________________________ __ 200
A conventional paper print having a silver
image formed thereon is immersed in either of '20 and is thereafter washed thoroughly, It may
be cleared in a 2% hydrochloric acid solution and
the aforementioned solutions for obtaining ‘the
is then dipped in a neutral 10% potassium iodide
metallic ferrocyanide image, an immersion in
solution. Thereafter, a sheet comprising an
either of said solutions for over two minutes giv
outer layer of molecularly oriented polyw'nyl
ing good results. It is then immersed in the
alcohol, containing approximately 10% by weight
sodium hydroxide bath either with or without
being ?rst washed in sodium thiosulfate to re 25 of maleic acid, is brought into contact with said
print whereby iodine is released and is trans
move the silver salts. The print is then dipped
ferred to said sheet to give the desired dichroic
in a 10% potassium iodide solution which con~
image.
tains no acid. Thereafter, a sheet comprising an
It will be noted that in every example given
above, it is contemplated that the iodine image
outer layer of molecularly oriented polyvinyl
alcohol, containing approximately 10% by Weight
will be formed in a sheet of a high polymer
which is molecularly oriented. It is conceivable
that the novel transformation of a silver image
to an iodine image may be useful in connection
with other processes than the formation of di
of vmaleic acid, is brought into contact with
said .print whereby iodide is released and is trans
ferred to said sheet to give the desired dichroic
image.
'
Example 4
A conventional paper print having a silver
image formed thereon vis immersed in a bleaching
solution consisting of:
chroic images and, accordingly, it is expressly
understood that unless the claims so specify, they
, are not limited to the formation of an iodine
'
image in a carrier which is molecularly oriented.
c. 0. 40
Where-an oriented carrier is used, i. e., a dichroic
image is desired, it is preferable that all those
portions of the carrier penetrated by the iodine
be molecularly oriented since application of the
Potassium dichromate, one per-cent solution- 100
Hydrochloric acid, N solution ____________ __
5
for approximately one minute, and ‘is ‘then
washed and cleared in a 1% solution of sodium‘ '
bicarbonate, a'washing for about one minutein Hr. Ur
the latter solution being sufficient. The print is
then washed thoroughly and dipped into a 10%
neutral solution of potassium iodide. There
after, a sheet comprising an outer layer of molec
ularly oriented polyvinyl alcohol, containing
approximately 10% by weight of maleio acid, is
brought into contact with said print whereby
iodine is released and is transferred to said sheet
to givethe desired dichroic image.
Example 5
Alpaper print containing a silver-image is im
mersed in a bleaching solution consisting of a
mixture of a solution of :
Lead nitrate_'_ __________________ __fgrams__ _
'7
Water _______________________ __'___‘__'c. c__ 100
and asolutionof:
dichroic material to unoriented portions will ~
‘produce a non-dichroic light-absorbing’ stain.
As has been previously stated, ‘the foregoing
description is illustrative only of operative em
bodiments of the present invention. It must be
emphasized that each step therein is a variable,
and that none of the ingredients, times, or pro-‘
portions for any step or solution are critical ex
cept insofar as they may be made so by the other
variables. ‘The speci?c examples given com
prise operative embodiments of the invention
55 with which excellent results have been obtained.
~However,'_considerable variation is possible in
virtually any vdegree thereof, and one or more
solutions or steps can be compensated for in the
other steps. It is, accordingly, obvious that no
60 set rules can be given and it wouldzbe di?i'cult, if
‘not impossible, even toset outside limits on the
range of variation.
,
.
.
g It should be pointed. out also that although the
'
Potassium ferricyanide__'___l _____ .._grams__
4'
Glacial acetic acid ____ _; ___________ __c. c__
2
Water ____'_ _______________________ __c. c_.. 300
and is bleached therein for approximately five
foregoing description emphasizes the formation
of iodine images which are ‘duplicates of photo
graphic silverimages, the inventionis in no Way
limited ,to the exclusive .use of photographically
obtained silverimages.
.
minutes. The print is then immersed in a'solu- I g.
'It isto beunder‘stoo'cl that-theterm ‘frelatively
tion consisting of :
70 Watereinsoluble”. as» utilized. in the- claims in . ref
erence to the.carrier for the silver image refers
,Potassium dichromate ____________ __gram__
1
to an insolubility such as will. prevent Water solu
'Water ______ __‘ ___________ _i____.____>_c. vc_‘_ I200
for'approximat'ely three, minutes. .It is prefer
tions .fromappreciably' dissolving saidcarrier in
the time in which the reactionstransforming the
ably washed and then‘cleared, for example?n a 75 silver image to the iodine image take place.
2,409,922;
97
It
also to be understood that the term “image
in iodine” as used in the claims refers to an image
formed of'iodine or its complexes._
Since certain changes may be made in carry
ing out the above process ‘without departing from
the scope of the invention, it is intended that all
matter contained in the above description shall
be interpreted as illustrative and not in a limiting
sense.
10
a permeable, ' relatively ‘water-insoluble’ carrier,
transforming said silver image to an image
formed'of a" relatively water-insoluble oxidizing
compoundof a polyvalent metal in a higher va
lence form, and ‘reacting said last-named image
with an iodide in the presence of an acid where
by iodine is released and replaces the oxidizing
compound to form an image in iodine.
'
u
7. The method of producing an iodine image,
'
It is also to be understood that the following 10 which comprises forming the image in silver in
a permeable, relatively water-insoluble carrier,
claims are intended to cover all the generic and
transforming said silver image to an image com
speci?c features of the invention herein described,
prising a relatively water-insoluble hydroxide of
and all statements of the scope of the invention
a polyvalent metal in a higher valence form, and
which, as a matter of language, might be said to
reacting said last-named image with an iodide
15
fall therebetween.
' ‘What is claimed is:
I
1. The method of producing an iodine image,
which comprises forming the image in silver in
a permeable, relatively water-insoluble carrier,
transforming said silver image to an image
formed of a relatively water-insoluble oxidizing
agent, and reacting said last-named image with
an iodide in the presence of a solvent for said
in the presence of-ani acid whereby iodine is re-‘
leased and replaces the hydroxide to form an
image in iodine.
"
-
'
i8; The method of producing an iodine image,
which comprises forming the image inv silver in
a permeable, relatively water-insolublev carrier,
transforming said silver image'to an image com
prising cupric hydroxide, and reacting said last
water-insoluble oxidizing agent which dissolves
named imagewith an iodide in thepresence of
places the oxidizing agent to form an image in
9. The method of producing an iodine image,
which comprises'forming the image in silver in
the latter and causes it to release iodine from the 25 an acid whereby iodine is released and replaces
the hydroxide to form an image in iodine‘. »
iodide whereby the iodine which is released re
iodine.
2; The method of producing an iodine image,
whichcomprises forming the image in silver in
a permeable, relatively water-insoluble carrier,
transforming said silver image to an image
formed of a relatively water-insoluble oxidizing
compound of a polyvalent metal in a higher va
a permeable, relatively water-insoluble carrier,
transformingsaid silver image to an image com
prising ferrichydroxide, and reacting said last-J
named image with an iodide in the presence of
an acid whereby iodine is released and replaces
the hydroxide to form an image in iodine.
'
said water-insoluble oxidizing compound which
10; The method of producing an iodine image,
which comprises forming the image in silver in
a permeable, relatively water-insoluble carrier,
dissolves the latter and causes it to release iodine
from the iodide whereby the iodine which is re
prising ‘a relatively water-insoluble, chromate of
an image in iodine.
chromate and a, salt of saidmetal, and reacting
said chromate image with an iodide in the pres
lence form, and reacting said last-named image 35
with an iodide in the presenceof a solvent for
transforming said silver image to an image com
leased replaces the oxidizing compound to form 40 a metal by reacting said silver image with a bi
.
3. The method of producing an iodine image,
which comprises forming the image in silver in
a permeable, relatively water-insoluble carrier,
transforming said silver image to an image com
prising a relatively water-insoluble hydroxide of
a polyvalent metal in a higher valence form, and
reacting said last-named image with an iodide
in the presence of a solvent for said hydroxide
which dissolves the latter and causes it to release
iodine from the iodide whereby the iodinewhich
is released replaces the‘ hydroxide to form an
image in iodine.
.
'
, -
4. The method of producing an iodine image,
which comprises forming the image in silver in
a permeable, relatively water-insoluble carrier,
transforming said silver image to an image, com
prising a relatively water-insoluble chromate, and
reacting said last-named image with an iodide
in the presence of a, solvent for said chromate
which dissolves the latter and causes it to release
iodine from the iodide whereby the iodine which
is released replaces the chromate to form an
image in iodine.
5. The method of producing an iodine image, 65
ence of an acid whereby'iodine is released and
replaces the chromate to form an image in iodine.
' 11. The method of producing an iodine image,
which comprises forming'the image in silver in
a permeable, relatively water-insoluble carrier,
reacting said silver image with a ferricyanide to
form ‘an image comprising silver ferrocyanide,
reacting said ferrocyanide'image with a salt of
a polyvalent metal in a, higher valence form to
transform the image to an image comprising a
water-insoluble ferrocyanide of said metal, trans
forming ‘said last-named image to an image com
prising the hydroxide of said ‘metal, and react
ing saidlast-na‘med image with an iodide in the
presence'of an acid whereby iodine is released and
replaces the hydroxide to form an image in iodine.
12. The method of producing an iodine image,
which comprises forming the image in silver in
a permeable, relatively water-insoluble carrier,
transforming said silver image to an image com
prising ferric ferrocyanide by reacting said silver
image with a ferricyanide and then reacting the
product of said reaction with a, ferric salt, trans
forming the ferric ferrocyanide image to an image
which comprises forming the image in silver in
comprising ferric hydroxide by reaction with a
a permeable. relatively water-insoluble carrier,
base, and reacting said last-named image with
transforming said silver image to an image
an'iodide in the presence of an acid whereby
formed of a relatively water-insoluble oxidizing
agent, and reacting said last-named image with k O iodine is released and replaces the ferric hydrox
an iodide in the presence of an acid whereby
ide to form an image in iodine. ‘
13. The method of producing an iodine image,‘
which comprises forming the image in silver
in a permeable, relatively water-insoluble carrier,
6. The method of producing an iodine image,
which comprises forming the image in silver in 75 transforming said silver image to an image com-'
iodine is released and replaces the oxidizing agent
to form an image in iodine.
,
2,409,923
11
12
prising cupric ferrocyanide by reactingsaidsilver»
acting said 1ast~namedimage with an iodide‘ in
image with a ferricyanide and-then reacting the
product of said reaction with a cupric salt, trans
forming the cupric .ferrocyanide image to an
image‘ comprising cupric hydroxide by reaction’
the presence of an acid whereby iodineris re
with a base, and reacting saidlast-named image
Whichcomprises forming the image in silver in
.
leased and replaces the hydroxide to form an
image in iodine.
,
.
19; The method of producing a dichroic image,
with an iodide in the presence of an acid .whereby
a relatively water-insoluble carrier comprising
at least a layer of a permeable molecularly
oriented high polymer having an af?nity for
icle to form an imagein iodine.
i
‘14. The method of producing an iodine image, 10 icdineand adapted'to form a dichroic sorption
Whichoomprises forming the image in silver in a
complex therewith, said layer supporting said
permeable, ' relatively water-insoluble carrier,
silver image, transforming said silver image to.
transforming said silver image to an image com
an image comprising ferric hydroxide, and re
prising, a water-insoluble ferrocyanide of a
acting said. last-named image with an iodide in
polyvalent metal in a higher valenceform by im 15 the presence of an acid whereby iodinev is released.
mersing said carrier, in a solution comprising a
and replaces the hydroxide» to form‘ an image-in
ferricyanide, a salt of said metal and an organic
iodine.
compound adapted to inhibit direct reaction be
20. The method of producing-a dichroic image,
tween said ferricyanide and'said salt, transform
which comprises forming the image in silver
ing said‘metal ferrocyanide image to an image 20 inarelatively water-insoluble carrier comprising
at. least a layer of a permeable molecularly
comprising a hydroxide of said metal, and react
ing: said last-named image with an iodide in the
oriented. high polymer having an a?inity for
presence of an acid whereby iodineis released
iodine and adapted'to form a dichroic sorption
and replaces the metal hydroxide to form an
complex therewith, said layer supporting said
image in iodine.
,
25 silver image, transforming said silver image to an
15. The method of producing a dichroic image,
image comprising a relatively water-insoluble
iodine is released and replaces the cupric hydrox
which comprises forming the image'in silver in
a relativelywater-insolublecarrier comprising at
chromate, and reacting said last-named image
with an iodide in the presence of an acid whereby
least a layer of a permeablemolecularly oriented
iodineis released and replaces the chromate to
high polymer having an affinity for iodine'and 30
adapted to form a' dichroic‘sorption complex.
forman image in iodine.
therewith, said-layer supporting said silver image,
transforming said silver image to an image
formed of a relatively water-insoluble oxidizing
.
a
2.1. The method of producing a dichroicimage,
which comprises forming the image in silver
in a relatively water-insoluble carrier. comprising
at least a layer of va permeable molecularly
agent, and reacting said last-named image with 35 oriented high polymer having an affinity for
iodine is released and replaces the oxidizing
iodine and adapted to form adichroic sorption
complex therewith, said layer supporting said
agent to form an image'in iodine.
16. The method of producing a dichroic image,
ferrieyanide to form an imagecomprising silver
an iodide in the presence of an acid whereby
silver image, reacting said silver image with a .
which, comprises'formin-g'the image in silver in
ferrocyanide, reacting said ferrocyanide image
a relatively water-insoluble carrier comprising at
least a layer of a permeable molecularly oriented
high polymer having an a?inity for iodine and
adapted to form a dichroic sorption complex
with a salt of a polyvalent metal in, a. higher
valence form to transform the image to an
image comprising awater-insoluble ferrocyanide
of said metal, transforming said last-named
therewith, said layer'supporting said silver image, 45 image to an image comprising the hydroxide of
transforming said silver image to an image
said metal, and reacting said last-named image
formed of' a relatively water-insoluble‘ oxidizing
compound of a. polyvalent metal in a higher
iodine is released and‘ replaces the hydroxide to
valence form, and reacting said- last-named image
form an image in iodine.
with an iodide in the presence of an acid whereby 50
22. The method of producing a dichroic image,
which comprises forming the image in silver in
a relatively water-insoluble carrier comprising at
iodine is released and replaces the'oxidizing com
pound toform- an image in iodine.
17. The method of producing a dichroic image,
which comprises. forming the image in silver
in a relatively water-insoluble carrier comprising
at least, a layer of a permeable molecularly
with an iodide in the presence of an acid whereby
least a layer of a permeable molecularly oriented
high, polymer having an. a?inity for iodine and
adapted to form a dichroic sorption complex
therewith, sai-d‘laye-r supporting said silver image,
oriented» high. polymer having an aliinity for
transforming, said silver image to an image com~
iodineand- adapted to form a dichroic sorption
prising ferric ferrocyanide by reacting saidsilver
complex therewith, said layer supporting said
image with a ferricyan-ide and then reacting the
silver image, transforming said silver image to 60 product of said reaction With ferric salt, trans
an image comprising a relatively water-insolu
ble hydroxide of a, polyvalent metal in a higher
forming the ferric ferrocyanide image to an image
comprising ferric hydroxide by reaction with a
valence form, and reacting said'last-namedv image
base, and reacting said last-named image with an
with aniodide in the presence of an acid whereby
iodide in the presence of an acid whereby iodine
iodine is released and ‘replaces the hydroxide to 65 is released and replaces the ferric hydroxide to
form an image in iodine;
form an image in iodine.
'
18-. The method of producing a dichroic image,
23. The method of producing a dichroic image,
which comprises forming the image‘ in: silver in
which comprises forming the image in silver in a
a relatively water-insoluble carrier comprising
relatively water-insoluble carrier comprising at
atv least a layer ofv a permeable molecularly‘ 70 least a layer of a permeable molecularly oriented
oriented high polymer having ‘an- a?inity for
high polymer having an a?inity for iodine and
iodine and adapted to form a dichroic sorption
adapted to form a dichroic sorption complex
complex. therewith, said layer supporting said
silver image, transforming said silver image to
therewith, said layer supporting said silverimage,
transforming said silver image to an image com
animage comprising cupric hydroxide, and 1.1.? 75 prising cupric ferrocyanide by reacting said sil
2,409,923
13
14
var image with a ferricyanide and then reacting
the product of said reaction with a cupric salt,
places the cupric hydroxide to form an image in
transforming the cupric ferrocyanide image to
an image comprising cupric hydroxide by reac
29. The method of producing a dichroic image,
which comprises forming the image in silver in a
carrier having at least the layer which supports
said silver formed of a molecularly oriented poly
iodine.
tion with a base, and reacting said last-named
image with an iodide, in the presence of an acid
'
whereby iodine is released and replaces the cupric
vinyl alcohol, transforming said silverimage to
hydroxide to form an image in iodine.
an image comprising a water-insoluble ferro
cyanide of a polyvalent metal in a higher va
24. The method of producing a dichroic image,
which comprises forming the image in silver in 10 lence form by immersing said carrier in a solu
tion comprising a ferricyanide, a salt of said
metal and an organic compound adapted to in
hibit direct reaction between said ferricyanide
a carrier having at least the layer which supports
said silver formed of a molecularly oriented polye
vinyl alcohol, transforming said silver image to
and said salt, transforming said metal ferrocy
an image formed of a relatively water-insoluble
oxidizing compound of a polyvalent metal in a 15 anide image to an image comprising a hydroxide
higher valence form, and reacting said last
of said metal, and reacting said last-named image
named image with an iodide in the presence of
an acid whereby iodine vis released and replaces
the oxidizing compound to form an image in
with an iodide in the presence of an acid whereby
20
iodine.
V
iodine is released and replaces the metal hy
25. The method of producing a dichroic image,
which comprises forming the image in silver in
a carrier having at least the layer which supports
said silver formed of a molecularly oriented poly
vinyl alcohol, transforming said silVer image to
an image comprising a relatively water-insoluble
vhydroxide of a polyvalent metal in a higher va
droxide to form an image in iodine.
30. The method of producing a dichroic image,
which comprises forming the image in silver ina
carrier having at least the layer which supports
said silver formed of a molecularly oriented poly
vinyl alcohol, transforming said silver image to
an image comprising a relatively water-insoluble
chromate of a metal by reacting said silver image
with a bichromate and a salt of said metal, and
reacting said chromate image with an iodide in
the presence of an acid whereby iodine is released
iodine is released and replaces the hydroxide to 30 and replaces the chromate to form an image in
iodine.
form an image in iodine.
31. The method of producing a dichroic image,
26. The method of producing a dichroic image,
which comprises forming the image in silver in
which comprises forming the image in silver in a
a permeable, relatively‘ water-insoluble carrier,
carrier having at least the layer which supports
said silver formed of a molecularly oriented poly 35 transforming said silver image to an image formed
of a relatively water-insoluble oxidizing agent,
vinyl alcohol, reacting said silver image with a
reacting said last-named image with an iodide in
ferricyanide to form an image comprising silver
the presence of an acid whereby iodine is released
ferrocyanide, reacting said ferrocyanide image
lence form, and reacting said last-named image
with an iodide in the presence of an acid whereby
with a salt of a polyvalent metal in a higher va
‘ and replaces the oxidizing agent to form an
lence form to transform the image to an image 40 image in iodine, and bringing into face-to-face
contact with said carrier a transparent molecu
comprising a water-soluble ferrocyanide of said
larly oriented high polymer adapted to form a
metal, transforming said last-named-image to an
image comprising the hydroxide of said metal,
and reacting said last-named image ‘with an
iodide in the presence of an acid whereby iodine
is released and replaces the hydroxide to form
an image in iodine.
,,
,
v
27; The method of producing a dichroic image,
which comprises forming the image in silver in a
dichroic sorption complex with iodine and having
a greater a?inity for iodine than said carrier.
32. The method of producing a dichroic image,
which comprises forming the image in silver in’ a
permeable,
relatively ' water-insoluble
carrier,
transforming said silver image to an image formed
of a relatively water-insoluble oxidizing compound
carrier having at least the layer which supports 50 of a polyvalent metal in a higher valence form,
reacting said last-named image with an iodide in
said silver formed of a molecularly oriented poly
the presence of an acid whereby iodine is released
vinyl alcohol, transforming said silver image to
and replaces the oxidizing compound to form an
an image comprising ferric ferrocyanide by re—
image
in iodine, and bringing into face-to-face
acting said silver image with a ferricyanide and
then reacting the product of said reaction with a 55 contact with said carrier a transparent molecu
larly oriented high polymer adapted to form a
ferric salt, transforming the ferric ferrocyanide
dichroic
sorption complex with iodine and having
image to an image comprising ferric hydroxide by
a greater a?inity for iodine than said carrier.
reaction with a base, and reacting said last-named
33. The method of producing a dichroic image,
image with an iodide in the presence of an acid
which comprises forming the image in silver in a
whereby iodine is released and replaces the ferric 60 permeable, relatively Water-insoluble carrier, re
hydroxide to form an image in iodine.
acting said silver image with a ferricyanide to
28. The method of producing a dichroic image,
form an image comprising silver ferrocyanide,
which comprises forming the image in silver in
reacting said ferrocyanide image with a salt of a
a carrier having at least the layer, which supports
polyvalent metal in a higher valence form ‘to
said silver formed of a molecularly oriented poly
transform the image to an image comprising a
vinyl alcohol, transforming said silver image to
water-insoluble ferrocyanide of said metal, trans
an image comprising cupric ferrocyanide by re
forming said last-named image ‘to an image com
acting said silver image with a ferricyanide and
prising the hydroxide of' said metal, reacting said
then reacting the product of said reaction with 70 last-named image with an iodide in the presence
a cupric salt, transforming the cupric ferrocy
of ‘an acid whereby iodine is released and re
anide image to an image comprising cupric hy
places the hydroxide to form an image in iodine,
droxide by reaction with a base, and reacting said
and bringing into face-to-face contact with said
last-named image with an iodide in the presence
carrier a transparent molecularly oriented high
of an acid whereby iodine is released and re-' 75 polymer adapted to form a dichroic sorption com
2,409,923
15
1,6
plex with iodine and having a greater a?inity for
which comprises forming the image in silver in
a permeable, relatively water-insoluble carrier,
and bringing into face-to-face contact with'said
carrier a mole'cularly oriented‘ polyvinyl’ alcohol.
39. The method of producing a dichroic image,
which comprises forming the image in silver in
a permeable, relatively water-insoluble carrier,
transforming said silver image to an image com
transforming said silver image to an image com
iodine than said carrier.
.34. The method of producing a dichroic image,
prising ferric ferrocyanide by reacting said silver
prising ferric ferrocyanide by reacting said silver
image with a ferricyanide and then reacting the
product of said reaction with a ferric salt, trans
forming the ferric ferrocyanide image to an image
comprising ferric hydroxide by reaction with a
base, reacting said last-named image with an
iodide in the presence of an acid whereby iodine
image with a ferricyanide and then reacting the
product of said reaction with a ferric salt, trans
forming the ferric-ferrocyanide image to an image
comprising ferric hydroxide by reaction'with a
base, reacting said last-named image with- an
iodide in the presence of an’ acid whereby iodine
is released and replaces the ferric hydroxide to
is released and replaces the ferric hydroxide to
form an image in iodine, and bringing into face
to-face contact with said carrier a transparent
form an image in iodine, and bringing into face
to~face contact with said carrier a molecularly
molecularly oriented high polymer . adapted to
oriented polyvinyl alcohol.
form a dichroic sorption complex with iodine and
having a greater ailinity for iodine than said
40. The method of producing a dichroic image,
which comprises forming the image in silver in a
-
permeable, relatively water-insoluble ‘carrier,
carrier._
35. The method of producing a dichroic image,
transforming said silver image to an image com
which comprises forming the image in silver in a
prising cupric ferrocyanide by reacting said silver
permeable, relatively watereinsoluble carrier,
image with a ferricyanide and then reacting the
product of said, reaction with a cupric salt, trans
forming the cupric ferrocyanide image to an image
transforming said silver image to an image com- -
prising cupric ferrocyanide by reacting said silver
comprising cupric hydroxide by reaction with a
base, reacting said last-named. image. with an
image with a ferricyanide and then reacting the
product of said reaction with a cupric salt, trans
forming the cuprie ferrocyanide image to an
iodide in the presence of an acid whereby iodine
image comprising cupric hydroxide by reaction
is released and replaces the cupric hydroxide-t0
with a base, reacting said last-named image with
an iodide in the presence of an acid whereby
iodine is released and replaces the cupric hy
droxide to form an image'in iodine, and bringing
into face-to-face- contact with said carrier a trans
form an image in iodine, and bringing into face;
to-face contact with saidv carrier a molecularly
to form a dichroic sorption complex with iodine
and having a greater affinity for iodine than said
carrier.
36. The method of producing a dichroic image,
transforming said silver image to an image formed
of a relatively water-insoluble ‘oxidizing, agent,
oriented polyvinyl alcohol.
'
41. The method of producing a. dichroic image,
which comprises forming theimage in silver in
parent molecularly oriented high polymer adapted 35 a permeable, relatively water-insoluble carrier,
immersing said carrier in aniodide solution, and
bringing said carrier into‘ face-to-face. contact
which comprises forming the image in silver in 40 with a, transparent molecularly oriented high
polymer containing an acid and adapted. to
a permeable, relatively water-insoluble carrier,
transforming said silver image to an image formed
form a dichroic sorption . complex. with iodine
of a relatively water-insoluble oxidizing agent,
whereby iodine is released to produce an image in
reacting said last-named image with an iodide in
the presence of an acid whereby iodine is released
42. The method of producing a dichroic image,
and replaces the oxidizing agent to form an image
which comprises forming theimage in silver in a
in iodine, and bringing into face-to-face contact
permeable, relatively water-insoluble carrier,
with said carrier a molecularly oriented polyvinyl
transforming said silver image, to animage
said
alcohol.
;
3'7. The method of producing a dichroic image,
which comprises forming the image in silver in a
permeable, relatively water-insoluble carrier,
transforming said silverimage to an image formed
of a relatively water-insoluble oxidizing com
pound of a polyvalent metal in a higher valence
form, reacting said last-named image with an
iodide in the presence of an acid whereby iodine
is released and replaces the oxidizing compound
to form an image in iodine, and bringing into
face-to-face contact with said carrier a molecu 60
larly oriented poyvinyl alcohol.
38. The method of producing a dichroic image,
which comprises forming the image in silver in
a permeable, relatively water-insoluble carrier,
reacting said silver image with a ferricyanide
to form an image comprising silver ferrocyanide,
reacting said ierrocyanide image with a salt of
a polyvalent metal in a higher valence form to
transform the image to an image comprising a
water-insoluble ferrocyanide of said metal, trans
forming said last-named image to an imagecom
prising the hydroxide of said metal, reacting said
last-named image with an iodide in the presence
of an acid whereby iodine'is released and re~
places the hydroxide to form an image in iodine, 75
polymer.
_
.
,
~
7
formed of a relatively water-insoluble oxidizing
compound of a polyvalent metal; in ,a, higher
valence form, immersing said carrier in an iodide
solution, and bringing said carrier into face-to
face contact with a transparent molecularly ori
ented high polymer containing an acid, and
adapted to form a, dichroic sorption complex
with iodine whereby iodine is released to produce
an image in said polymer.
_
43. The method of producing a dichroic image,
which comprises forming the image in silver in a
permeable, relatively water-insoluble carrier, re
acting said silver image with a ferricyanide to
form an image comprising silver ferrocyanide, re
acting said ferrocyanide image with a salt'of a
polyvalent metal in a higher valence form to
transform the image to an image comprising a
water-insoluble ferrocyanide of said metal, trans
forming said last-named image to an image com
prising thehydroxide of said metal, immersing
said‘ carrier in an iodide solution, and bringing
said carrier into face-to-face contact with a
transparent molecularly oriented high polymer
containing an acid and adapted to form a di
chroic sorption complex with iodine whereby io
dine is released to produce an image in said poly
mer.
-
,
o
2,409,923
17
44. The method of producing a dichroic image,
which comprises forming the image in silver in a
permeable, relatively water-insoluble carrier,
transforming said silver image to an image com
18
prising ferric ferrocyanide by reacting said silver
image with a ferricyanide and then reacting the
product of said reaction with a ferric salt, trans
forming the ferric ferrocyanide image to an image
prising ferric ferrocyanide by reacting said silver in comprising ferric hydroxide by reaction with a
image with a ferricyanide and then reacting the
product of said reaction with a ferric salt, trans
forming the ferric ferrocyanide image to an image
hydroxide, immersing said carrier in an iodide
solution, and bringing said carrier into face-to
face contact with a molecularly oriented polyvinyl
alcohol containing an acid whereby iodine is
comprising ferric hydroxide by reaction with a
base, immersing said carrier in an iodide solution, 10 released to provide an iodine image in said poly
vinyl alcohol.
and bringing said carrier into face-to-face con
50. The method of producing a dichroic image, ,
tact with a transparent molecularly oriented high
which comprises forming the image in silver in a
polymer containing an acid and adapted to form
permeable, relatively water-insoluble carrier,
a dichroic sorption complex with iodine whereby
transforming said silver image to an image com
iodine is released to produce an image in said
prising cupric ferrocyanide by reacting said silver
polymer.
image with a ferricyanide and then reacting the
45. The method of producing a dichroic image,
product of said reaction with a cupric salt, trans
which comprises forming the image in silver in a
forming the cupric ferrocyanide image to an im
permeable, relatively water-insoluble carrier,
age comprising cupric hydroxide by reaction with
transforming said silver image to an image com
a hydroxide, immersing said carrier in an iodide
prising cupric ferrocyanide by reacting said sil
solution, and bringing said carrier into face-to
ver image with a ferricyanide and then reacting
face contact with a molecularly oriented poly
the product of said reaction with a cupric salt,
vinyl alcohol containing an acid whereby iodine is
transforming the cupric ferrocyanide image to
an image comprising cupric hydroxide by reaction . released to provide an iodine image in said poly
vinyl alcohol.
with a base, immersing said carrier in an iodide
51. The method of producing a dichroic image,
solution, and bringing said carrier into face-to
which comprises forming the image in silver in a
face contact with a transparent molecularly ori
permeable, relatively Water-insoluble carrier,
ented high polymer containing an acid and
transforming said silver image to an image com
adapted to form a dichroic sorption complex with
prising a relatively water-insoluble chromate, re
iodine whereby iodine is released to produce an
acting said last-named image with an iodide in
image in said polymer.
the presence'of an acid whereby iodine is released
46. The method of producing a dichroic image,
and replaces the chromate to form an image in
which comprises forming the image in silver in a
iodine, and bringing into face-to-face contact
permeable, relatively water-insoluble carrier,
with said carrier a transparent, molecularly ori
transforming said silver image to an image formed
of a relatively water-insoluble oxidizing agent, im
ented high polymer adapted to form a dichroic
sorption complex with iodine and having a
greater affinity for iodine than said carrier.
bringing said carrier into face-to-face contact
52. The method of producing a dichroic image,
with a molecularly oriented polyvinyl alcohol con
which comprises forming the image in silver in
taining an acid whereby iodine is released to pro
a permeable, relatively water-insoluble carrier,
vide an iodine image in said polyvinyl alcohol.
transforming
said silver image to an image com
47. The method of producing a dichroic image,
prising a relatively water-insoluble chromate, re
which comprises forming the image in silver in a
permeable, relatively water-insoluble carrier, 45 acting said last-named image with an iodide in
the presence of an acid whereby iodine is released
transforming said silver image to an image formed
and replaces the chromate to form an image in
of a relatively water-insoluble oxidizing com
iodine, and bringing into face-to-face contact
pound of a polyvalent metal in a higher valence
with said carrier a molecularly oriented poly
form, immersing said carrier in an iodide solu
tion, and bringing said carrier into face-to-iace 50 vinyl alcohol.
53. The method of producing a dichroic image,
contact with a molecularly oriented polyvinyl a1
which comprises forming the image in silver in
cohol containing an acid whereby iodine is re
a permeable, relatively water-insoluble carrier,
leased to provide an iodine image in said polyvinyl
transforming said silver image to ‘an image com
alcohol.
48. The method of producing a dichroic image, 55 prising a relatively water-insoluble chromate,
1mmers1ng said carrier in an iodide, and bringing
which comprises forming the image in silver in a
I said carrier into face-to-face contact with a trans
permeable, relatively water-insoluble carrier, re
parent,‘ molecularly oriented high polymer con
acting said silver image with a ferricyanide to
taining an acid and adapted to form a dichroic
form an image comprising silver ferrocyanide,
sorption complex with iodine whereby iodine is
reacting said ferrocyanide image with a salt of a
released to produce an image in said polymer.
polyvalent metal in a higher valence form to
54. The method of producing a dichroic image,
transform the image to an image comprising a
which comprises forming the image in silver in
Water-insoluble ferrocyanide of said metal, trans
a permeable, relatively water-insoluble carrier,
forming said last-named image to an image com
transforming said silver image to an image com
prising the hydroxide of said metal, immersing
prising a relatively water-insoluble chromate, im
said carrier in an iodide solution, and bringing
mersing said carrier in an iodide, and bringing
said carrier into face-to-face contact with a mo
said carrier into face-to-face contact with a
lecularly oriented polyvinyl alcohol containing an
molecularly oriented polyvinyl alcohol containing
acid whereby iodine is released to provide an
an acid whereby iodine is released to provide an
iodine image in said polyvinyl alcohol.
70 iodine image in said polyvinyl alcohol.
49. The method of producing a dichroic image,
ARTHUR BARNES.
which comprises forming the image in silver in a
HELEN P. HUSEK.
permeable, relatively water-insoluble carrier,
transforming said silver image to an image com
mersing said carrier in an iodide solution, and.
Certi?cate of Correction
Patent No. 2,409,923.
October 22, 1946.
ARTHUR BARNES ET AL.
It is hereby certi?ed that errors appear in the printed speci?cation of the above
numbered patent requiring correction as follows: Column 3, line 42, for “in a sheet”
read on a sheet; column 7, line 33, for “iodide” read iodine; column 8, line 62, for
‘ range” read ranges; column 12, line 60, claim 22, before “ferric” insert the article a;
column 13, line 41, claim 26, for “Water-soluble” read water-insoluble; and that the
conform to the record of the case in the Patent O?ice.
Signed and sealed this 2nd day of November, A. D. 1948.
[SEAL]
THOMAS F. MURPHY,
Assistant Uommz'ssioner of Patents.
Certi?cate of Correction
Patent No. 2,409,923.
’
October 22, 1946.
numbered patent requiring correction as follows: Column 8, line 42, for “in a sheet”
read on a sheet; column 7, line 33, for “iodide” read iodine; column 8, line 62, for
“range” read ranges; column 12, line 60, claim 22, before “ferric” insert the article a;
column 13, line 41, claim 26, for “Water-soluble” read water-insoluble; and that the
said Letters Patent should be read with these corrections therein that the same may
conform to the record of the case in the Patent Office.
Signed and sealed this 2nd day of November, A. D. 1948.
[SEAL]
THOMAS F. MURPHY,
Assistant Commissioner of Patents,
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