A NEW OR IMPROVED PROCESS OF PRODUCING COLOURED PICTURES ON CANVAS, SHEET METAL, AND OTHER MATERIALS BY TRANSFER OF COLOURED PHOTOGRAPHS
Year: 1879

page_text: PROVISIONAL SPECIFICATION left by William Lloyd Wise at the Office of
the Commissioners of Patents on the 24th February 1879. (A communication
from abroad by Johannes Schuhmacher, of Römisch Posel, Sörnewitz, near
Heissen, Saxony, Artist, and Gustav Stade, of Dresden, Saxony, Merchant.)
WILLIAM LLOYD WISE, of Chandos Chambers, Adelphi, in the County of
Middlesex. "A NEW OR IMPROVED PROCESS OF PRODUCING COLOURED PICTURES
ON CANVAS, SHEET METAL, AND OTHER MATERIALS BY TRANSFER OF COLOURED
PHOTOGRAPHS." (A communication from abroad by Johannes Schuhmacher, of
Römisch Posel, Sörnewitz, near Heissen, Saxony, Artist, and Gustav Stade, of
Dresden, Saxony, Merchant.)
This Invention has reference to the transferring on to canvas, sheet metal, and
other materials of coloured photographic pictures.
The photographic pictures to be coloured are photographed on chalked paper
which has been prepared and overspread with a gelatine solution in a well known
manner, and which prepared surface has been covered with a further layer of
solution of collodion of silver, these pictures are then fixed in the manner well
known in the art of photography.
Their surfaces are then coloured, preferably with oil colours, the tints being
applied in a sketchy manner, leaving the photograph to yield the drawing and
modulation or shading, as will be hereinafter explained.
After the colours have dried they are covered or drawn over with French retouch
varnish, and pasted or caused to adhere with the coloured side to the canvas or
other material.
The adhesive substance employed may consist of curds and lime, or it may be
re-touch varnish. The coloured picture will now be situate between the paper and
the canvas. The chalk paper covered with the gelatine solution is then removed
by washing with lukewarm water, leaving on the canvas or other material the
completed picture, which is then covered with West Indian copal varnish.
Pictures as described, in lieu of being transferred on to canvas, may be transferred
on to sheet metal, wood, stone, glass, or other material.
If the material to which the picture is to be transferred be dark, as for instance
a jet black tray, the coloured side of the photograph is covered uniformly with a
white colour in order to prevent the dark ground of the tray from becoming
translucent.

page_text: The white colour having dried is spread over with adhesive varnish; after a while
the photograph is pasted or caused to adhere to the tray.
The varnish having been allowed to dry, lukewarm water is poured over the
photograph, then the chalked paper with the gelatine is removed (which is easily
done), the coloured photograph remaining and being set off clearly.
Photograph and tray may then be covered with varnish to preserve the former
from wear and prevent it washing off. A spirituous varnish however must not be
employed for this purpose as it would destroy the collodion skin forming the
photograph or picture.
Where the sheet metal is submitted to a process of burning, as is the case with
trays, to fasten the colour or the coating of varnish, such burning will not damage
the photograph or picture, as the latter will stand a temperature of 150° Réaumur.
The process above described leaves the photographic pictures perfectly intact, and
and does not produce faults in design or in shading.