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Patented Dec. 31, 1946
2,413,631
UNITED STATES PATENT OFFICIE
2,413,631
_WHITENING EGGS
James D. Ingle, Chicago, Ill.,_ assignor to Indus
trial Patents Corporation, Chicago, Ill., a cor
poration of Delaware
No Drawing. Application September 6, 1940,
Serial No. 355,667
20 Claims. ( Cl. 99-230)
This invention relates to the treatment of shell
eggs and has to do particularly with a method of
improving the color of egg shells. The color of
egg shells in many cases aiiects the marketability
of the eggs. Many consumers prefer white shell
eggs to buff, although the color of the shell does
not affect the quality of the egg material.
The principal object of this invention is to
provide a method of whitening buii colored egg
shells without affecting the egg material.
10
The present invention contemplates treatment
of colored shell eggs with an oxidizing agent
whereby the color of the egg shell is substan
tially improved.
2
not destroyed or Whose usefulness is not impaired
by the presence of a strong acid is satisfactory
for use. Other examples of wetting agents are
sulphated higher alcohols, such as the commer
cial product Duponol, alkylated aryl sulphonates,
such as the commercialproduct Santomerse, sul
phated esters of higher alcohols and dibasic
acids, such as the commercial product Aerosol,
and the like.
In preparing the whitening solution, I have
found that any of the common alkalis or inor~
g'anic acids may be used for preparing the acid or
alkaline oxidizing agents as the case may be.
I preferconcentrations ranging from 5 per cent
to 66 per cent as the liquid medium. Examples
of inorganic acids which are satisfactory for the
purposes of my invention are hydrochloric acid,
It has been found that oxidizing agents remove
from the egg shell the bloom which is a protein
material containing the color. The oxidizing
agent causes a disintegration and removal of
nitric acid, and sulphuric acid. Suitable alkalis
the bloom.
include ammonia, aqueous solutions of ammonia,
Any suitable oxidizing agent may be used, in 20 sodium
hydroxide, and potassium hydroxide.
cluding acid or alkaline oxidizing agents,
Theamount
of oxidizing agent is not cricital
although I prefer to use acid oxidizing agents.
but in practice I prefer to use a solution contain
Examples of acid oxidizing agents are: nitric
ing from 5 per cent to 40 per cent oxidizing agent.
acid, aqua, regia, chromic acid, chromates plus
The most satisfactory oxidizing agents are s01u~
mineral acids, chloric acid, perchloric acid, chlo
tions of nitric acid, aqua regia and the dichro
rine plus water, bromine plus water, manganese
mates, for example, potassium dichromate and
‘dioxide plus sulphuric acid, lead dioxide plus sul~
sodium dichromate.
phuric acid, lead tetra acetate plus acetic acid,
I have found that a solution containing 20
per-organic acids (as perbenzoic), formaldehyde
per
cent sodium dichromate, 40 per cent concen
peroxide, and hydrogen peroxide in acid.
trated hydrochloric acid, and 40 per cent water,
Alkaline oxidizing agents which are contem_
and containing a small amount of a wetting agent
plated include: hydrogen peroxide or other per
produces a very satisfactory solution for the pur
oxides in alkalies, alkaline potassium perman~
poses of my invention.
ganate, chromates, Fehling solution, ammoniacal
As an example of the operation of my inven
silver nitrate, Schweitzer’s reagent, and perbo- .
tion, the eggs are immersed in the solution for
rates.
a period of about ?ve seconds to ten seconds and
The oxidizing agent is preferably used in a
then washed while brushing lightly. After the
?uid or liquid form in order to facilitate proper
eggs have been immersed in the solution, they
contact with the egg shell. Aqueous solutions
may be immersed in or subjected to the action of
are preferred although other solvents in which
a 5 per cent alkali solution and then washed with
the oxidizing agent is soluble may be employed.
out brushing. Buff colored shell eggs treated in
An aqueous acid solution of the oxidizing agent
accordance with this invention are changed to a
has been found to give excellent results.
white color comparable to that of the usual white
In practicing the invention, the eggs are sub
color of egg shells.
jected to the action of a solution of the oxidizing
agent and are than washed while the surface is
The treatment does not a?ect the quality of
brushed lightly.
The brushing operation may
be eliminated by treating the eggs with an acid
or alkali neutralizing solution after the treat
ment.
The solution of the oxidizing agent may be im
proved by the addition of a small amount of a
wetting agent, for example, the sulphonated aro
matlc naphthalene product known on the market
as Nacconol NR. Any wetting agent which is
the egg material or the usual shrinkage of eggs
during storage periods.
This application is a continuation in part of
my application, Serial No. 262,288, which was
?led March 16, 1939.
Obviously many modi?cations and variations
of the invention hereinbefore set forth may be -
made without departing from the spirit and scope
thereof, and therefore only such limitations
2,413,631
3
should be imposed as are indicated in the ap
a small amount of a wetting agent and thereafter
washing the‘ eggs while brushing the surfaces.
10. The method of whitening buff colored shell
pended claims.
I claim:
1. In a method of treating buff colored shell
eggs, the step of disintegrating and removing
bloom by immersing the eggs in an aqueous solu
tion containing from 5 per cent to 60 per cent
of an inorganic acid, from 5 per cent to 40 per
cent of an oxidizing agent, and a small amount
of a wetting agent.
4
chloric acid, 20 per cent sodium dichromate, and
'
2. In a. method of treating bu?' colored shell
eggs which comprises disintegrating and remov
ing the bloom of the shell by immersing the eggs
for a period of from ?ve to ten seconds in an
aqueous solution containing 40 per cent hydro
chloric acid, 20 per cent sodium dichromate, and
10 a small amount of a wetting agent and there
after immersing‘ the eggs in a dilute solution of
an alkali.
eggs, the step which comprises disintegrating
11. In a method of treating bu? colored shell
and removing the bloom of the shell by immers
eggs, the step which comprises disintegrating
ing the eggs in a solution containing hydro
and removing the bloom of the shell by immers
chloric acid, a dichromate, and a small amount 15 ing the eggs in an aqueous solution containing
of a wetting agent,
an inorganic acid and a dichromate.
3. In a method of treating buff colored shell
12. In a method of treating buff colored shell
eggs, the step which comprises removing and
eggs, the step which comprises disintegrating and
disintegrating the bloom of the shell by immers
removing the bloom of the shell by immersing
ing the eggs in an aqueous solution containing
the eggs in an aqueous solution containing an
20 per cent sodium dichromate, 40 per cent hy
inorganic acid, a dichromate, and a small amount
drochloric acid, and a small amount of a wet
of a wetting agent.
ting agent.
13. The method of whitening naturally colored
4. In a method of treating buff colored shell
shell eggs which comprises disintegrating and re
25
eggs, the step which comprises disintegrating and
moving the bloom of the shell by treating the
removing the bloom of the shell by immersing
shell with a solution containing an oxidizing
the eggs in an aqueous solution containing nitric
acid and a dichromate.
5. In a method of treating buff colored shell
agent.
14. The method of treating naturally colored
shell eggs to improve the color which comprises
eggs, the step which comprises disintegrating
the step of disintegrating and removing the bloom
and removing the bloom of the shell by immers
by treating the shell with a solution containing
ing the eggs in an aqueous solution containing
an acid oxidizing agent.
sulphuric acid and a dichromate.
15. A method according to claim 14 in which
6. The method of whitening buff colored shell
the oxidizing agent is nitric acid.
eggs which comprises disintegrating and. remov
16. In a method of treating naturally colored
ing the bloom of the shell by immersing the eggs
shell eggs, the step which comprises disintegrat
in an aqueous solution containing an inorganic
ing and removing the bloom of the shell by sub
acid and a dichromate and thereafter washing
jecting the shell to the action of a whitening
the solution from the surface of the eggs.
solution, the whitening solution comprising an
40
7. The method or" whitening bu? colored shell
alkaline oxidizing agent.
eggs which comprises disintegrating and remov
1'7. A method according to claim 16 in which
ing the bloom of the shell by immersing the eggs
the alkaline oxidizing agent is alkaline potas
in an aqueous solution containing an inorganic
sium permanganate.
acid and a dichromate and thereafter immersing
18. In a method of treating buff colored shell
45
the eggs in a dilute alkaline solution.
eggs, the step of disintegrating and removing the
8. The method of whitening buff colored shell
eggs which comprises disintegrating and remov
ing the bloom of the shell by immersing the eggs
bloom which comprises subjecting the shells to
the action of an acid and an oxidizing agent.
19. In a methodof treating buff colored shell
for a period of from ?ve to ten seconds in an
eggs, the step of disintegrating and removing the
50
aqueous solution containing 40 per cent hydro
bloom which comprises subjecting the shells to
chloric acid, 26 per cent sodium dichromate, and
the action of an acid solution containing an
a small amount of a wetting agent and thereafter
oxidizing agent,
removing the solution from the surface of the
20. In a method of treating buff colored shell
eggs.
eggs, the step of disintegrating and removing the
9. The method of whitening buff colored shell
bloom which comprises immersing the eggs in a
eggs which comprises disintegrating and remov
solution containing an inorganic acid and an
ing the bloom of the shell by immersing the eggs
oxidizing
agent.
for a period of from ?ve to ten seconds in an
JAMES D. INGLE.
aqueous solution containing 40 per cent hydro
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