Improvements in and connected with Photographic Paper, Plates, and Diapositives.
Year: 1897

page_text: Date of Application, 4th May, 1897
Complete Specification Left, 19th Jan., 1898-Accepted, 4th July, 1898
PROVISIONAL SPECIFICATION.
Improvements in and connected with Photographic Paper, Plates,
and Diapositives.
We, MAX JOLLES and LEON LILIENFELD, both of the Firm of Jolles, Lilienfeldt
& Co., of 80, Wahringerstrasse, Vienna IX., Austria, Chemical Manufacturers, do
hereby declare the nature of this invention to be as follows:
-
This invention has for its object to provide improved photographic paper,
plates and diapositives and consists chiefly in using for the film which contains
substances sensitive to light, albuminous substances of grain soluble in alcohol,
such as fibrine, mucedine, gliadine and the like cach by itself or mixed together,
or in connection with albumen, gelatine, gelloidin (collodion) or other ingredients
suitable for photographic purposes.
Our improved photographic paper, plates and diapositives may be produced for
instance as follows:
The albuminous substances are used in alcohol solution and may be deposited
upon the paper either suitably salted and afterwards sensitized or the substances
sensitive to light may be emulsified in the solution of albuminous substances, in
the following manner;-
The albuminous substance is dissolved in an alcohol, salted in the usual way
with a haloid and a solution of silver salt in a thin stream afterwards added thereto,
whereby the silver haloid salt produced will be uniformly emulsified. The addi-
tion of an organic acid and that of a substance which makes the paper pliant, such
as glycerine, castor oil and the like, is desirable. The method described may be
used cold or warm, the order of the additions may be varied at will and the finished
emulsion is used for the production of the plates, paper or diapositive in the usual
manner.
The paper thus produced, besides being brought in the market completely ready
for use and remaining good for months, has the advantage of being highly
sensitive, superseding in this respect albumen paper and being equal to the best
collodion paper.
The picture produced on the paper or plates will not change even if strongly
exposed to the sun, retains the white parts perfectly pure and is not liable to go
yellow.
Compared with the papers hitherto known particularly with the collodion papers,
our improved paper has the advantage that the film which is sensitive to light can
not be easily scratched and compared with the gelatine paper that the same even
at a high temperature will not blister in the bath.
The improved paper permits also of being treated in the bath in quantities as
the same is not liable to roll or otherwise change undesirably.
The treatment of the paper is most simple as the same can be toned off rapidly
and properly in any bath without having to prepare the bath specially as is the
case when using other emulsion papers and the consumption of gold is very small.
The paper. requires also no special attention in the toning bath as it can be
n •
17

page_text: exceedingly easy toned off and fixed. The pictures obtained after the toning off
and fixing are extraordinary sharp the dark parts show extraordinary beauty and
the light parts are particularly clear.
F. BOSSHARDT & Co.,
Agents to Applicants.
Improvements in and connected with Photographic Paper, Plates,
and Diapositives.
We, MAX JOLLES and LEON LILIENFELD, both of 80, Wahringerstrasse, Vienna,
IX., Austria, Chemical Manufacturers, do hereby declare the nature of this inven-
tion and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement:-
This invention has for its object to provide improved photographic paper,
plates and diapositives and consists chiefly in using for the film which contains
substances sensitive to light, albuminous substances of vegetable origin soluble in
alcohol, such as fibrine, mucedine, gliadine and the like each by itself or mixed
together, or in connection with albumen, gelatine, gelloidin (collodion) or other
ingredients suitable for photographic purposes.
Our improved photographic paper, plates and diapositives may be produced for
instance as follows:-
The albuminous substances are used in alcohol solution and may be deposited
upon the paper either suitably salted and afterwards sensitized or the substances
sensitive to light may be emulsified in the solution of albuminous substances, in
the following manner;
The albuminous substance is dissolved in an alcohol, salted in the usual way
with a haloid and a solution of silver salt in a thin stream afterwards added thereto,
whereby the silver haloid salt produced will be uniformly emulsified. The addi-
tion of an organic acid and that of a substance which makes the paper pliant, such
as glycerine, castor oil and the like, is desirable. The method described may be
used cold or warm, the order of the additions may be varied at will and the finished
emulsion is used for the production of the plates, paper or diapositive in the usual
manner.
The method of producing the said chlorine silver emulsion and the proportions
of the ingredients used, say for producing 8 litres are as follows; —
First of all 350 gramme of vegetable fibrine are dissolved in warmed ethyl alcohol
of 90 per cent. strength and the solution obtained allowed to cool.
To this solution are added 06 litre alcoholic solution of lithium- and strontium-
chloride and afterwards in ethyl alcohol 02 litre of a solution of citric acid of
20 per cent. strength.
After obtaining this solution which may be termed "solution No. 1," 500
gramme nitrate of silver are dissolved in half a litre of hot water, to which is added
when at boiling point a litre of
pure alcohol.
This solution termed "No. 2" in a hot and thin jet is then poured into solu-
tion No. 1 whilst shaking the latter.
To the fluid obtained are added 30 gramme of glycerine and then alcohol of
90 per cent. strength in quantity to make up the 8 litres.
The emulsion thus obtained is put on baryta paper by any of the well known
means and the paper afterwards dried.

page_text: The paper thus produced, besides being brought in the market completely ready
for use and remaining good for months, has the advantage of being highly
sensitive, superseding in this respect albumen paper and being equal to the best
collodion paper.
The picture produced on the paper or plates will not change even if strongly
exposed to the sun, retains the white parts perfectly pure and is not liable to go
yellow.
Compared with the papers hitherto known particularly with the collodion papers,
our improved paper has the advantage that the film which is sensitive to light can
not be easily scratched and compared with the gelatine paper that the same even
at a high temperature will not blister in the bath.
The improved paper permits also of being treated in the bath in quantities as
the same is not liable to roll or otherwise change undesirably.
The treatment of the paper is most simple as the same can be toned off rapidly
and properly in any bath without having to prepare the bath specially as is the
case when using other emulsion papers and the consumption of gold is very small.
The paper requires also no special attention in the toning bath as it can be
exceedingly easy toned off and fixed.
The pictures obtained after the toning off and fixing are extraordinary sharp the
dark parts show extraordinary beauty and the light parts are particularly clear.
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:-
In and connected with photographic paper, plates and diapositives, the use for
the respective films which contain substances sensitive to light, of albuminous
substances of vegetable origin soluble in alcohol, such as fibrine, mucedine,
gliadine and the like each by itself or mixed together, or in connection with
albumen, gelatine, gelloidin (collodion) or other ingredients suitable for photo-
graphic purposes, all substantially as set forth.
Dated this 18th day of January 1898
F. BOSSHARDT & Co.,
4, Corporation Street, Manchester, Agents to Applicants.