Improvements in and connected with Photographic Printing Paper and the like.
Year: 1895

page_text: Date of Application, 13th May, 1895
Complete Specification Left, 8th Feb., 1896-Accepted, 14th Mar., 1896
TRUVIDIONAL DEBUIETATION.
Improvements in and connected with Photographic Printing Paper
and the like.
I, FERDINAND HRDLICZKA-CSISZAR of No 80 Schottenfeldgasse of the City
of Vienna, in the Empite of Austina Manufacturer do hereby declare the nature
of my said invention to be as follows
Silver-mitrate paper, like the so-called albumen-paper, celloidin paper, the
various known gelatine or asto-papers, as also arrowroot and algein-paper and
plates, films or other sensitized surfaces prepared with silver nitrate yield (when
reproducing negatives) a print having a certam degree of bulliancy, differing
according to the kind of paper used, the so-called aristo-paper gives the most
brilliant print, but "thin" and dull or fogged negatives prepared with such paper
yield in every instance dull and foggy punts e. prints lacking contrast.
According to the present invention certain substances are added to the silver
nitrate preparation, it being thereby rendered possible to obtain good prints with
high light on silver nitiate paper or other preparations even from the dullest
negatives which cannot be reproduced by the processes at present resorted to.
This result is arrived at by adding ferio-prussiate or monochromic, diclu omic or
polichiomic salts or chiomic-acid to the known preparations of one of the silver
mitrates, a chromate or dichromate of silver being thus formed either during the
sensitizing of the paper or plate, or during the preparation of the emulsion.
The pinting, toning and fixing of a ribbon prepared from such a paper or plate
showed, on being tested in Professor Vogel's photometer, that it printed very
apidly, which means in practice that very thin, poor and dull negatives yield
brilliant pints on auch paper or plates.
As example, I shall now describe the employment of the above-mentioned
chemicals in combination with a celloidiu o aristo-emulsion, also for a peison
skilled in the art no further explanation is necessary, seeing that the print is
rendered brilliant by adding any of the substances above-mentioned and that the
determination of the amount of such substances to be added for yielding various
degrees of brilliancy or the employment of the proper paper or plato prepared
according to this invention for a certain dull negative, is a matter which experience
will teach.
First, the known solution of lithium-chloride, citric acid and alcohol is prepared
by heating same, to which a solution of celloidin-collodions is then added; Bilver
Ditrate is now dissolved in hot water, anhydrous alcohol added and heated to
boiling point, the resulting solution of silver nitrate being then gently poured into
the collodion mixture containing chlorine. The known emulsion of chlorate of
silver-collodion is thus obtained.
According to this invention, however, ammonium-chromate or bichiomate is now
dissolved in water and mixed with as much alcohol as the solution admits without
being unclear; the other chromates or compounds of ferric cyanates may be
prepared in like manner. The solution is now added drop by drop to the said
known emulsion, (which is at the same time vigorously agitated) until tests show
that positives of the desired brilliancy may be obtamed from the poor and dull
negatives to be printed. By observing this procedure it is possible to obtain &
series of silver-paper or plates of different printing properties,

page_text: Ansto-paper which does not print very readily may be produced in the same
manner. The employment of said salts in connection with the various salted
papers, such as albumen, aurowioot, rosin paper etc. is more simple, if being only
necessary to add a few drops of the solution of above-mentioned salts to the
emulsion preparation, the reaction with the silver uitrate not being effected until
the paper is sensitized in the silver bath.
Dated this 13th day of Mar 1905
MARKS & CLERK,
18 Southampton Buildings, London, W.C., Agents.
Improvements in and connected with Photographic Printing Paper
and the like.
I, FERDINAND IRDLICZKA-CSISZAR of No 80 Schottenfeldgasse of the City of
Vienna, in the Empue of Austria do hereby declare the nature of my said invention
and in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement :-
The known silver salt paper-for instance the so-called albumen-paper, celloidin
paper, the vauous known gelatine or aristo-papor, as also arrowroot and algeine-
paper and plates, when used for printing or reproducing negatives gives a print
whose degree of bulliancy differs according to the kind of paper used, the so-called
aristo-paper gives the most brilliant print, but "thin" and "flawy" negatives
prepared with such paper yield in every mstance but flawy and dull prints, ie punts
lacking contrast.
According to the present invention, certain substances are incorporated with a
silver-salt pieparation and by means of the resulting compound good bught prints
with high lights may be obtamed even from the dullest negatives which cannot be
reproduced by the processes at present resorted to.
This is effected by adding feiro-prussiate or monochromic, dichromic, or poly-
chromic salts on chromic-acid, or manganates or permanganates to the known
preparations, for producing silver-salt paper, a chiomate or dichromate of silver is
thereby formed either during the sensitizing of the paper or during the preparation
of the emulsion.
The printing, toning and fixing of a ribbon prepared from such paper showed,
on being tested in Professor Vogel's photometet, that it printed very rapidly,
which in pinctice signifies that very thin, flawy and dull negatives yield brilliant
prints on such paper
I shall now describe by way of example the employment of the abovementioned
chemicals in combination with a celloidin or austo-emulsion, although for a person
skilled in the art no further explanation is necessary, seeing that the punt is
rendered brilliant by adding any one of the substances abovementioned, while the
determining of the amount of such substances to be added for producing various
degrees of brilliancy, as also the employment of the proper paper or plate prepared
according to this invention for a certain flawy negative, is a matter which experience
alone can show.
Fust, the known solution of 1.3 grams of lithium-chloride, 1 gram citric-acid
and 50 cubic centimeters alcohol 18 prepared by heating, I cubic centimeter of a
4% solution of celloidin-collodions being then added; 12 grams of silver-salt is
Dow dissolved in 5 cubic centimeters of hot water, 150 cubic centimeters anhydrous
alcohol added and then heated to boiling point; the resulting solution of silver-
mitrate is now gradually poured into the clilorous-collodion mixture. The known
emulsion of chloride of silver collodion is thus obtained.
According to this invention, however, about 1 gram ammonium-chromate, or

page_text: bichromate, is dissolved in 10 cubic-centimeter of water and mixed with as much
alcohol as the solution admits without being mado turbid; the other chromates, or
compounds of fetic cyanates may be prepared in like manner. This solution is
now allowed to drip into the known emulsion (which is at the same time vigorously
agitated) until tests show that positives of the desired brilliancy may be obtained
from the thin and flawy negatives to bo printed. By following this procedure,
it is possible to obtain a series of silver-paper or plates of different printing
properties
Bame manner.
Aristo-paper which does not print very readily may also be produced in the
The employment of said salts in connection with the various salted
papers, such as albumeu, arrowroot, rosin paper and the like, is not so difficult, it
being only necessary to add a few drops of the solution of above-mentioned salts to
the emulsion preparation, the reaction with the silver nitrate not being effected
until the paper is sensitized in the silver-bath.
Although it is taken for granted that the silver salt preparation is known, it may
be well to give one of the compositions of 4% celloidin-collodions, vic.

page_text: The same effect may be obtained with ferric cyanates, manganates and the like,
whether the emulsion is used on paper, glass poi celain, wood, leather, silk, or like
substances.
The following is a good austo-gelatine emulsion: 100 grams of gelatine is put
for half an hour into 500 cubic-centimeter of water and then heat applied until the
gelatino dissolves. To this solution is added
20 grams citric acid dissolved in
100 cubic centimeter of water and
2 gram scignette-salt dissolved in
10 cubic centimeter water; and finally
50 cubic centimeter of a 10% solution of chloride of ammonium.
The whole is now heated to 40° Centigrade and a silver solution composed of
30 gram silver-nitrate and 500 cubio centimeter of water at 30° Centigrade added
drop by drop to sanie, tho emulsion being thoroughly stirred all the time.
The above gives the ordinary aristo-emulsion, which on adding more or less of
the additional substances as before described, may be brought to the desired state
of perfection.
Having now particularly described and ascertamed the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. The herein-described process of making a silver-salt preparation for photo-
graphic purposes, consisting in adding to a known silver-salt preparation, substances,
'such as ferric cyanates or chromates, which attenuate or retard the effect of the
resulting emulsion substantially as described.
2. As new articles of manufacture, silver-salt preparations or paper for photo-
graphic purposes prepared from an emulsion made by adding ferric-cyanatos,
chromates or the like to a huown silver-salt preparation, substantially as described
in the foregoing Specification and as set forth in Claim 1.
Dated thi
دليم
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents.