Improvements in Means for Obtaining Photographic Images.
Year: 1892

page_text: Date of Application, 25th Mar., 1892
Complete Specification Left, 20th Dec., 1892-Accepted, 25th Feb., 1893
PROVISIONAL SPECIFICATION.
Improvements in Means for Obtaining Photographic Images.
I, CLAUDE KENNEDY MILLS, of 23 Southampton Buildings in the County of
Middlesex, Patent Agent, do hereby declare the nature of this invention, a com-
munication to me from Auguste Lumière and Louis Lumière both of 21 Rue
St. Victor Lyon Montplaisir in the Republic of France, Chemists, to be as
follows:-
In treating alkaline manganates or per-manganates with acids and more
particularly with organic acids, such as tartaric acid, citric acid, oxalic acid, lactic
acid &c. the communicators have succeeded in obtaining salts of sesquioxide or of
binoxide of manganese, the greater number of which have been incapable of
preparation hitherto.
These manganic salts are sensible to light and under its influence are reduced to
the condition of manganous salts.
The invention consists in the application of this property to the obtaining of
photographic images by a process of which the following is a description.
The salts of sesquioxide and of binoxide of manganese employed alone or
combined with reducing substances or with bodies which increase their sensitivity
are reduced by light.
These salts can therefore be employed to impregnate paper (ordinary, gelatinized,
coated albumenized &c.) either by using them in aqueous solution in a collodion or
mixed with mucilages.
The collodions with manganic salts or the mucilaginous solutions of these same
salts can also be spread upon glass or other support.
The sensitive surfaces are brown, yellow, greenish or red according to the
manganic salts employed, they become white at the parts acted upon by light.
In treating the proofs thus obtained with an appropriate reactive inert upon
manganous salts but capable of giving a precipitate or a coloration with the
manganic salts not reduced by light, the image will be fixed and at the same time
its color and intensity will be modified.
In order that the invention may be more clearly understood I will give the
description of one method of working :-
:-
Permanganate of potash is treated with lactic acid, which gives a brown solution ;
to this is added glucose, a reducing body which increases the sensitivity, then it is
filtered and on the surface of this liquid is floated a sheet of gelatine paper.
This is dried and exposed to the light behind a positive image. When the
proof is well decolorized in the ground, it is treated with a solution of hydrochlorate
of paramidophenol which in becoming oxidized wherever the manganic salt has not
been acted upon by light gives a brownish black color to these places. It is then
only necessary to wash and dry it.
The lactic acid may be replaced by another organic acid (oxalic, citric, tartaric,
cetic &c. &c.) the permanganate of potash may be replaced by another alkaline or
arthy alkaline permanganate or even by a manganate and the glucose by another
educing agent (sulphite of soda, hydrate of chloral &c.).
The following substances may be used as developer fixer, salts of monamines, of
iamines, of amidophenols, their homologues, etc., the following substances have
iven good results.
Nitrate of aniline, sulphate of diphenylamine, hydrochlorate of naphtylamine,
ydrochlorate of naphtylamine, toluidine, hydrochlorate of phenylene diamine,

page_text: hydrochlorate of benzidine, sulphate of paramidophenol, aniline, toluidines,
guaiacol etc. etc.
Various tones can be obtained by then treating with a base or with an acid.
Dated this 25th day of March 1892.
By Harris & Mills,
23, Southampton Buildings, London, W.C., Agents.
COMPLETE SPECIFICATION.
Improvements in Means for Obtaining Photographic Images.
1, CLAUDE KENNEDY MILLS, of 23 Southampton Buildings, in the County of
Middlesex, Patent Agent, do hereby declare the nature of the said invention, (a
communication to me from Auguste Lumière and Louis Lumière, both of 21 Rue
St. Victor, Lyon Montplaisir, in the Republic of France, Chemists,) and in what
manner the same is to be performed to be particularly described and ascertained
in and by the following statement :-
In treating alkaline manganates or permanganates with acids, and more particu-
larly with organic acids, such as tartaric acid, citric acid, oxalic acid, lactic
acid, &c., the communicators have succeeded in obtaining salts of sesquioxide or of
binoxide of manganese, the greater number of which have been incapable of
preparation hitherto.
These manganic salts are sensible to light and under its influence are reduced to
the condition of manganous salts.
The invention consists in the application of this property to the obtaining of
photographic images by a process of which the following is a description.
The salts of sesquioxide and of binoxide of manganese, employed alone or
combined with reducing substances or with bodies which increase their sensitivity,
. are reduced by light.
These salts can therefore be employed to impregnate paper (ordinary, gelatinized
coated, albumenized, &c.,) either by using them in aqueous solution in a collodion
or mixed with mucilages.
The collodions with manganic salts, or the mucilaginous solutions of these same
salts, can also be spread upon glass or other support.
The sensitive surfaces are brown, yellow, greenish or red, according to the
manganic salts employed; they become white at the parts acted upon by light.
In treating the proofs thus obtained with an approximate reactive inert upon
manganous salts, but capable of giving a precipitate or a coloration with the
manganic salts not reduced by light, the image will be fixed and at the same time
its color and intensity will be modified.
In order that the invention may be more clearly understood I will give the
description of one method of working.
1'
Permanganate of potash is treated with lactic acid, which gives a brown solution;
to this is added glucose, a reducing body which increases the sensitivity, then it
is filtered and on the surface of this liquid is floated a sheet of gelatine paper.
This is dried and exposed to the light behind a positive image. When the proof
is well decolorized in the ground, it is treated with a solution of hydrochlorate of
paramidophenol, which, in becoming oxidized wherever the manganic salt has not
been acted upon by light, gives a brownish black color to these places. It is then
only necessary to wash and dry it.
The lactic acid may be replaced by another organic acid (oxalic, citric, tartaric,
acetic, &c., &c.); the permanganate of potash may be replaced by another alkaline
or earthy alkaline permanganate or even by a manganate, and the glucose by another
reducing agent (sulphite of soda, hydrate of chloral, &c.).
The following substances may be used as developer fixer; salts of monamines, of

page_text: diamines, of amidophenols, their homologues, &c. The following substances have
given good results:-
Nitrate of aniline, sulphate of diphenylamine, hydrochlorate of naphtylamine,
toluidine, hydrochlorate of phenylene diamine, hydrochlorate of benzidine, sulphate
of paramidophenol, aniline, toluidines, guaiacol, etc. etc.
Various tones can be obtained by then treating with a base or with an acid.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed 1 declare that what I
claim is :-
The application to photography of manganic salts, employed alone or combined
with reducing substances, to obtain a sensitive surface, which, after exposure to
light, will be treated with reactives capable of differentiating the non-affected
manganic salts from the manganous salt resulting from the reduction of the
manganic salt by light.
VA
December
1000
TOU20
By Harris & Mills,
C. K. MILLS,
23, Southampton Buildings, London, W.C., Agents.