IMPROVEMENTS IN THE PRODUCTION OF COLOURED ENGRAVINGS, PHOTOGRAPHS AND OTHER IMAGES
Year: 1884

page_text: I, JASPER WETTER, Engineer, of 67, Strand, in the city of Westminster, do
hereby declare the nature of said invention for IMPROVEMENTS IN THE PRODUCTION
OF COLOURED ENGRAVINGS, PHOTOGRAPHS AND OTHER IMAGES, a communication to
me from abroad by Lucien Forquignon, of Bordeaux, France, to be as follows:-
This invention relates, to a new method of obtaining coloured drawings, photo-
graphs and other images, on sheets of paper or other material which can be made
transparent.
For this purpose the colours are applied to the back side of the sheet carrying
the picture, and the sheet is afterwards made transparent.
The paper used as a base for the picture should be just sufficiently sized to
prevent it from blotting, but that it holds the colours applied to it. Photographic
copies obtained with salts of platinum are preferable to the ordinary copies
obtained with salts of silver.
Before applying the colour, the sheet is held against a window or placed upon
a glass desk, to reuder the same temporarily transparent.
After the sheet has been coloured, it is rendered permanently transparent by any
suitable process, but preferably by dipping it into a bath of white wax melted or
dissolved in spirit of turpentine. The excess of liquid is then allowed to drop off,
the sheet is placed between the sheets of blotting paper and subjected to the pres-
sure of a hot smoothing iron or rollers. Finally the thin sheet may be drawn on
cardboard, satined and enamelled like an ordinary photograph.

page_text: COMPLIE
I, JASPER WETTER, Engineer, of 67, Strand, in the City of Westminster, do
hereby declare the nature of my invention for IMPROVEMENTS IN THE PRODUCTION
OF COLOURED ENGRAVINGS, PHOTOGRAPHS, AND OTHER IMAGES, a communication
to me from abroad by Lucien Forquignon, of Bordeaux, France, and in what
manner the same is to be performed, to be particularly described and ascertained in
and by the following statement:-
This invention relates to a new method of obtaining coloured devices, drawings,
photographs, and other images on sheets of paper or other material which can be
imade transparent.
For this purpose the colours are applied to the back side of the sheet carrying
the device or picture, and'the sheet is afterwards made transparent.
The paper used as a base for the picture should be just sufficiently sized to
prevent it from blotting, but so that it holds the colours applied to it. Photo-
graphic copies obtained with salts of platinum are preferable to the ordinary copies
obtained with salts of silver.
Before applying the colour, the sheet is held against a window or placed upon a
glass desk, to render the same temporarily transparent.
After the sheet has been coloured, it is rendered permanently transparent by any
suitable process, but preferably by dipping it into a bath of white wax, melted, or
dissolved in spirit of turpentine. The excess of liquid is then allowed to drop_off,
the sheet placed between sheets of blotting paper and subjected to the pressure of
a hot smoothing iron.
Finally the thin sheet may be drawn on cardboard, satined and enamelled like
an ordinary photograph.
Having now. particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is
The method of colouring and finishing photographs drawings and other images
on material capable of being made transparent, by painting the sheet on the back
side, and then reudering it transparent, substantially as described.