An Improved Process for Producing Coloured Photographic Pictures.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
An Improved Process for Producing Coloured Photographic Pictures.
I, BERTHOLD KUNY, of No. 10, Heustrasse, Munich, in the Empire of Germany,
Painter, do hereby declare the nature of this invention to be as follows:-
:-
This invention has for its object the production of coloured photographs by
forming a pigment picture from a given negative, by means of a sensitive film
or layer which is not permeated with one and the same pigment over all its sur-
face, as in the processes of pigment or carbon printing at present employed, but
has differently coloured areas, corresponding in shape to certain areas of the
picture and which are coloured in the local colours corresponding to the original.
In order to render this possible, a transparent sheet (gelatine, paper or the
like) is attached to the film side of the negative by means of a transparent ad-
hesive substance (gum arabic, gelatine or the like)."
The sensitive layer or film may be of asphalt or chrome gelatine coloured with
pigments corresponding to the local tones of the original. In case the asphalt
method be employed the colours must be rubbed with turpentine oil and filtered.
Several glazing or transparent colours are suitable for use; in most cases Parisian
blue, sienna earth and carmine, suffice. If the chrome gelatine method be em
ployed, colours must be selected which are not attacked by chromate and which
may be dissolved or rubbed in water. The colours in this case also are added
filtered. Preferably the above mentioned colours are employed, although numer-
ous others are capable of being used.
The coloured solutions are applied to the transparent paper or gelatine after
the latter has been coated with gum arabic or the like transparent and easily
soluble adhesive substance and the coating has been dried, in such a way that in
the case of a protrait for instance, flesh tints lie over the face, whilst brown or the
like tints lie over the hair.
After the whole surface has been coated with the asphalt or chrome gelatine
film in a non-actinic light and dried in a dark chamber or a yellow light, the
negative is reproduced on this layer by exposing it to light without removing it
from the film. The use of a special printing frame is therefore not necessary,
as by the transparent sheet being stuck on the negative a firm whole is itself
formed. The picture is then developed in the ordinary manner and dried, after
which the transparent sheet together with the picture may be drawn off the
negative.
'
The copy where asphalt is used is developed with turpentine oil, whilst a copy
where chrome gelatine is used is developed with warm water.
In order to facilitate the drawing off of the picture from the negative, the
latter is rubbed with wax, paraffin or the like before the transparent sheet is
stuck on.
In sticking on. the edges of the negative plate are preferably overlanned by

page_text: the transparent sheet, in which case before drawing off the picture, these edges
must be first cut off.
The transfer of a picture to another medium or foundation for the purpose
of developing is unnecessary, because the copying takes place from the side of
the film (gelatine or paper sheet).
A "positive" results from the process herein before described. It has colours
corresponding with the local colours of the original, and is preferably coated on
the under side with toned white colour. It is then conveyed in the ordinary
manner onto cards or the like, after which the transparent sheet may be removed,
as it was coated with gum arabic or other soluble adhesive substance as before
stated before the emulsion was applied. This drawing-off of the transparent sheet
takes place when the positive produced is fully dry, for which object the surface
of the transparent sheet is suitably moistened, so that after some little time it can
be drawn off. By this means the coloured surface on the positive is entirely
free, so that it produces the impression of a painting. The sticking of the trans-
parent paper or the like on the negative has as a consequence the following ad-
vantages.
1. The transparent sheet fits thoroughly on the picture film, so that a thoroughly
smooth surface is thereby afforded.
2. Displacement of the transparent paper arising from variations in temperature
or moisture or even by accident in using a copying or printing frame are entirely
excluded.
3. In consequence of the adhesive substance the paper is uniformly transparent.
4. A copying or printing frame is rendered unnecessary.
Dated this 13th day of September 1899.
W. P. THOMPSON & Co.,
Of G, Lord Street, Liverpool, Agents for the Applicant.
I, BERTHOLD KUNY, of No. 10, Heustrasse, Munich, in the Empire of Germany,
Painter, 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:-
This invention has for its object the production of coloured photographs by
forming a pigment picture from a given negative, by means of a sensitive film
or layer which is not permeated with one and the same pigment over all its sur-
face, as in the processes of pigment or carbon printing at present employed, but
has differently coloured areas, corresponding in shape to certain areas of the
picture and which are coloured in the local colours corresponding to the original.
In order to render this possible, a transparent sheet (gelatine, paper or the
like) is attached to the film side of the negative by means of a transparent ad-
hesive substance (gum arabic, gelatine or the like).
The sensitive layer or film may be of asphalt or chrome gelatine coloured with
pigments corresponding to the local tones of the original. In case the asphalt
method be employed the colours must be rubbed with turpentine oil and filtered.
Several glazing or transparent colours, are suitable for use; in most cases Parisian
blue, sienna earth and carmine, suffice. If the chrome gelatine method be em-
ployed, colours must be selected which are not attacked by chromate and which

page_text: may be dissolved or rubbed in water. The colours in this case also are added
filtered. Preferably the above mentioned colours are employed although numer-
ous others are capable of being used.
The coloured solutions are applied to the transparent paper or gelatine after
the latter has been coated with gum arabic or the like transparent and easily
soluble adhesive substance and the coating has been dried, in such a way that in
the case of a portrait for instance flesh tints lie.over the face, whilst brown or the
like tints lie over the hair.
After the whole surface has been coated with the asphalt or chrome gelatine
film in a non-actinic light and dried in a dark chamber or a yellow light, the
negative is reproduced on this layer by exposing it to light without removing
it from the film. The use of a special printing frame is therefore not necessary,
as by the transparent sheet being stuck on the negative a firm whole is itself
formed. The picture is then developed in the ordinary manner and dried, after
which the transparent sheet together with the picture may be drawn off the
negative.
The copy where asphalt is used is developed with turpentine oil, whilst a copy
where chrome gelatine is used is developed with warm water.
In order to facilitate the drawing off of the picture from the negative, the latter
is rubbed with wax, paraffin or the like before the transparent sheet is stuck on.
In sticking on, the edges of the negative plate are preferably overlapped by
the transparent sheet, in which case before drawing off the picture, these edges
must be first cut off.
The transfer of a picture to another medium or foundation for the purpose of
developing is unnecessary, because the copying takes place from the side of the
film (gelatine or paper sheet).
A.positive" results from the process herein before described. It has colours
corresponding with the local colours of the original, and is preferably coated on
the under side with toned white colour. It is then conveyed in the ordinary
manner onto cards or the like, after which the transparent sheet may be removed,
as it was coated with gum arabic or other soluble adhesive substance as before
stated before the emulsion was applied. This drawing-off of the transparent sheet
takes place when the positive produced is fully dry, for which object the surface
of the transparent sheet is suitably moistened, so that after some little time it
can be drawn off. By this means the coloured surface on the positive is entirely
free, so that it produces the impression of a painting. The sticking of the trans-
parent paper or the like on the negative has as a consequence the following ad-
vantages.
1. The transparent sheet fits thoroughly on the picture film, so that a
thoroughly smooth surface is thereby afforded.
2. Displacement of the transparent paper arising from variations in temperature
or moisture or even by accident in using a copying or printing frame are entirely
excluded.
3. In consequence of the adhesive substance the paper is uniformly transparent
4. A copying or printing frame is rendered unnecessary.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed, I declare that what I
claim is:-
The process for producing coloured photographic pictures, which consists in
attaching a transparent sheet (gelatine, paper or the like) by means of a trans-
parent adhesive substance (gelatine, gum arabic or the like) on to the fixed
negative after the latter has been rubbed with wax, paraffin, or the like, then
coating it with gum arabic or other easily soluble adhesive substance and after-
wards with a sensitive layer or film of an asphalt or chrome gelatine solution of
different colours to correspond with the local tones of the original, and finally
exposing without a copying frame, developing, drying, and then drawing, it

page_text: off the negative, whereupon the transparent sheet after being first moistened
may be drawn off the positive when the latter has been transferred in the ordinary
way to cardboard or the like, substantially as herein before described.
Dated this 22nd day of May 1900.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicant.