Improvements in Chemical Compositions to be Used for Preparing the Surface of suitable Material for Photographio Prints.
Year: 1896

page_text: Date of Application, 26th Mar., 1896-Accepted, 9th May, 1896
COMPLETE SPECIFICATION.
Improvements in Chemical Compositions to be Used for Preparing
the Surface of suitable Material for Photographio Prints.
We, PAUL EMIL SCHOENFELDER and EMIL KEULE, of 27 South Orange
Avenue in the City of Newark, County of Essex and State of New Jersey, U.S.A.,
Chemists, do hereby declare the nature of this invention and in what manner the
same is to be performed to be particularly described and ascertained in and by
the following statement :-
The object of our invention is to provide a chemical compound or composition
for the preparation of paper, especially glazed paper, porcelain or any other suitable
material, on which photographic prints are to be made from a negative plate,
whereby the toning of the picture is accomplished simultaneously with the printing
and thus the subjecting of the print after it is made to a separate toning bath is
fully avoided.
Our composition consists of the following ingredients combined in the proportions
stated, and which we will call stock or ground solutions, viz. :-
STOCK SOLUTION A.
Collodion.
300 grains of pyroxyline.
1 lb. of ether.
1 lb. of alcohol absolute
STOCK SOLUTION B.
15 grains of a chloride of a metal of the platina class, such as
chloride of gold, of iridium, of rhodium, of osmium, of
palladium, or of platinum ;-
Said 15 grains of chloride being dissolved in ounce of alcohol (40%);-
From the stock solution A 1 ounces is thoroughly mixed with 10 drops of
stock solution B and the following ingredients are added in the proportions
stated, ri. :-
a.) 3 grains of an organic acid, such as citric acid, (tartaric acid, formic acid,
etc.), which is dissolved before mixing with the other ingredients, in 3 drops
of alcobol :-
b.) 15 grains of nitrate of silver or its equivalent, first dissolved in 50 drops of
40% alcohol.
c.) 1 grains of a chloride-such as chloride of strontium, or of barium, or
of zirconia-dissolved before mixing with the other ingredients in 3 drops
of 40% alcohol, and
d.) 2 drops of a softening chemical, such as glycerine-or castor oil.
The above emulsion is applied to the surface of the material on which the picture
or photo is to be printed.
The surface must be thoroughly dried before using.
After the print has been made, it is given a bath in a solution of hypo-sulphate
of soda-one part to 15 parts of water, in which bath it remains, until all superfluous
chemicals have been removed from the picture, (about 5 minutes), when it is taken
out and thoroughly washed in clean water.
The nicture is then ready for mounting and does not quire any additional

page_text: toning (as the toning has been accomplished simultaneously with the printing)
and it has a superior finish, that will not fade or turn yellow by being exposed to
light.
In place of stock solution A, a solution can be used, composed of gelatine one-
part and water three-parts, in which case the ingredients mentioned under a, b and c
are dissolved in water instead of alcohol.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim, is:
1. A chemical composition to be used for preparing the surface of suitable,
material for photographic purposes, consisting of a chloride of metal of the
platinum class, of nitrate of silver or its equivalent, a holding substance, and an
organic acid, such as citric acid, substantially as described.
2. A chemical composition to be used for preparing the surface of suitable
material for photographic prints, consisting of a salt of a metal of the platinum
class, of nitrate of silver or its equivalent, a holding substance, such as collodion,
an organic acid, such as citric acid, and glycerine or its equivalent, substantially as
described.
3. A chemical composition to be used for preparing the surface of suitable
material for photographic prints, consisting of a holding substance, such as
collodion, a salt of a metal of the platinum class, of nitrate of silver or its equivalent,
a chloride, such as chloride of strontium, a softening ingredient, such as glycerine,
an organic acid, such as citric acid, substantially as described.
Dated this 26th day of March 1896.
J. P. BAYLY,
18 Fulham Place, London, W., Agent for the Applicants.