US447087A - Half to louis rahmer - Google Patents

Description

- UNITED STATES PATENT Fries,

\VILLIAM SCHUMACHER, OF BROOKLYN, NEl/V YORK, ASSIGNOR OF ONE- HALF TO LOUIS RAI-IMER, OF SAME PLACE.

PROCESS OF PRINTING IN COLORS.

SPECIFICATION forming part of Letters Patent No. 447,087, dated February 24, 1891.

Application filed September 8, 1890. Serial No. 364,334. (No specimens.)

To all whom it may concern:

Be it known that I, WILLIAM SOHUMACHER, of Brooklyn, in the county of Kings and State of New York, a citizen of the United States, have invented certain new and useful Improvements in Processes of Printing in Colors, of which the following is a specification.

This invention relates to an improved process of printing in colors'in such a manner that the well-known character of a watercolor painting is closelyimitated, While ordinary lithographic stones or other printingsurfaces can be employed for this purpose; and the invention consists of a process of printing in colors by the following successive steps: first, producing the different tints by means of a brush and lithographic ink on a hard unilnpressible transfer-sheet of suitable material; secondly, transferring said wash-tints by transfer-sheets to lithographic stones or other printing-surface having grained surfaces, and, lastly, printing from said stones in different colors, so as to reproduce the original painting.

In carrying out my invention a number of thin transfer-sheets of a suitable hard unimpressible substancesuch as celluloid or other 1naterialare either placed one after the other over the water-color or other painting or on theimpression used as a key for said painting that is to be reproduced in color, care being taken that the proper register of the transfer-sheets with the original painting is retained. A transfer-sheet is used for each color of the original painting, While the transfer-sheet is placed in position over the original painting or on the key of said painting, the special tint being produced on the same by means of a brush or lithographic ink or crayon, or by means of a rub-tint, or in any other suitable manner, so that a so called wash-tint is produced, the different portions of which are graduated in proportion to the depth of color in the original painting. When opaque transfer-sheets are used, it is necessary to transfer the outlines of the different tints on said sheet by any of the methods known to 1ithographerssuch as, for instance, by making a key from the, original, which is offset on the transfer-sheet on which the wash-tints are produced by freely following the original, which is placed before the eyes of the artist. When as many transfer-sheets as there are colorsin the original painting are thus produced, the wash-tints in the same are transferred by the sheets to as many separate lithographic stones, zinc plates, or other printing-surfaces, which are provided with a suitable grain preparatory to receiving the wash-tints from the transfersheets. After the transfer of the wash-tints is made the printing-surfaces are coated with a layer of a solution of gum, and after dry- 'ing washed off, the printing-surfaces being then rolled up in the usual manner with transfer-ink. The stones are next prepared with gum and acid, like a crayon drawing. The Wash-tints are thereby broken up into small dots on the points of the raised portion of the grain,so that a practical printing-plate for the lithographic press, or for the reliefprinting press, after a relief-etching of the grain-plate is made, is obtained. The tints on the printing-surfaces are an exact reproduction of the wash-tints on the transfersheets, being denser at the heavier parts and thinner at the lighter parts. The different colors are then printed in register from the printing-surfaces until a picture is obtained, in which the characteristic features and tints of the original painting are faithfully reproduced. a

In addition to the wash-tints employed, graining or stipple effects may be added to the transfer-sheets and transferred with the wash-tints to the printing-surfaces, or they may be produced on said printing-surfaces in the usual manner.

Having thus described my invention, I claim as new and desire to secure by Letters Patent The process herein described of printing in colors, which consists in reproducing the different colors of the picture in wash-tints by means of lithographic ink or crayon on the surface of as many separate transfersheets as there are colors to be printed, then transferring the several Wash-tints from the In testimony that I clai n1 the foregoing as transfer-sheets to separate printing stones or my invention I have signed my name in presplates having grained surfaces, and then ence of two subscribing witnesses.

printing the different colors from said print- WILLIAM SCHUMACHER. ing-surfaces in register to correspond with \Vitnesses: the colors of the original picture, snbstan- W. REIMHERR, tially as described. PAUL GOEPEL.