An Improved Process for Producing Color-printing Plates by Means of Several Transparent Layers, Each of which is Provided with the Painting or Drawing of only One of Each of the Required Colors.
Year: 1889

page_text: Date of Application, 20th Apr., 1889
Specification Accepted, 25th May, 1889
An Improved Process for Producing Color-printing Plates by Means
of Several Transparent Layers, Each of which is Provided with
the Painting or Drawing of only One of Each of the Required
Colors.
I, MAURICE WIRTHS, of the City, County and State of New York, United States of
America, Publisher, do hereby declare the nature of my said invention, and in what
manner the same is to be performed, to be particularly described and ascertained in
and by the following statement:
..
My invention relates to an improved process for producing original paintings or
drawings in several colors, and also copies of original paintings or drawings in several
colors as well as coloring single tone pictures or pictures of like tone by painting or
drawing each single color on separate transparent layers, which when laid one above
another will, by means of their transparency, represent the entire color picture; and
my invention consists in the application of these transparent layers, each of which is
provided with the painting or drawing of only one of each of the required colors for
producing printing plates of such colors for re-producing the entire picture in printing
presses.
My improved process can be employed in producing color printing plates in various
ways.
Photographic negatives and diapositives of these transparent layers each of which is
provided with the painting or drawing in only one of each of the required colors can
be obtained by direct contact light copying or by photographing the same; these
negatives or diapositives will serve for producing Albertype plates, photoengraved
plates or photogravure plates.
If the contact copying by light or the photographing was done when employing a
lined, netted, punctuated or grained layer such negatives or diapositives will serve for
producing autotype printing plates or such negatives or positives can be transferred
on to stone, zinc plates or other etchable plates by means of photolithographic transfer
paper or any other layer sensitive to light.
If the painting or drawing in only one of each of the required colors is done in
colors suited for transfer printing and after these transparent layers have been provided
பட்ட

page_text: with a relief lined, netted or grained surface; or after these paintings or drawings
have been lined, netted, or grained; or if the transfer medium has been lined, netted
or grained direct transfers on stone zinc plates or other etchable plates can be obtained
even without employing any photographic process.
These transparent layers, each of which is provided with the painting or drawing of
only one of each of the required colors will also serve as models to the lithographer,
wood cutter, steel, copper and other engravers, who, in using them, will save the
troublesome and difficult work of extracting the single colors as it now has to be
done with all color pictures, in which the single colors are not painted on separate
transparent layers.
For transparent layers I can also make use of photographic negatives or positives
in which the outlines of the photographic picture will serve as a guide for painting or
drawing on each separate negative or positive only one of each of the required colors
and from which negatives or positives I can afterwards erase the whole photograph so
that only the painting or drawing of only one of each of the required colors remains
on these transparent layers for further use as described above.
Having now particularly described and ascertained the nature of my said invention,
and in what manner the same is to be performed, what I claim is :-
The production of paintings or drawings in single colors on separate transparent
layers, which, when laid one on another, will by means of their transparency represent
a complete colored picture and the application of the same in making press color
printing plates for lithographic, zinc plate and photolithographic printing, for woodcut
copper plate, and steel plate printing, for the Albertype, phototype, photoengraving,
photogravure, zincographic, heliographic, autotype and pigment printing processes
and for all press color printing in which printing plates created by means of photo-
graphic processes are used, substantially as and for the purpose set forth.
Dated this 20th day of Auril 1889.
PHILIP M. JUSTICE,
Associate Agent.