US690974A - Process of reproducing colored original etchings. - Google Patents

Description

llNrTnn nTnTns PATENT @rrrcra BERNI-IARD MANNFELD, OF FRANKFORT-ON-THE-MAIN, GERMANY.

PROCESS OF REPRODUCING COLORED ORiGlNAL ETCHINGS.

SPECIFICATION forming part of Letters Eatent No. 690,974, dated January 14, 1902.

Application filed April 7, 1899. Serial No. 712,072- (No specimens.)

To ctZl whom it nu/.7 concern.-

Be it known that I, BERNHARD MANNFELD, a subject of the King of Prussia,German Emperor, residing at Frankfort-on-the-ltlain, in the Kingdom of Prussia, Germany, have invented certain new and useful Improvements in Processes for the Reproduction of Colored Original Etchings, (for which I have applied for patents in England, dated January 27, 1899, No. 1,911; in Austria, dated December 31,1898; in Hungary, dated January 25,1899, No. 1,110; in Germany, dated February 14, 1899, and in France, dated January 27, 1899, No. 273,245,) of which the following is a specification.

My present invention relates to improvements in the production of colored prints; and the objects of my improvements are to enable the artist to produce the necessary printing-plates for the different colors himself without danger of the plates not exactly corresponding when printing and to free him from mechanical restrictions.

In carrying out my invention I engrave a plate in the usual manner-that is, I make the drawing on a copper plate covered by a thin coating of wax and etch the. same with some suitable acid. I then take a few prints of the plate and, if necessary, retouch the former until it is found to be quite correct, whereupon I make impressions of this plate one number of stones or on other metal plates, the number of which depends on the number of colors used. I etch these stones or metal plates, after covering the parts that have not to be acted upon with lithographic ink or Venetian chalk, according to whether the lights and shades of color are to stand out sharply or diifusedly. The parts covered by the lithographic ink are completely protected 011 etching, while those covered by the porous chalk are partially protected, so that a duller surface is produced at these parts which in printing produces a crayon-like shade. After preparing a stone or metal plate for each color in this manner I remove the ink or chalk with turpentine and then coat the parts uncovered with color. I now make consecutive impressions of each of these stones or plates on well- Inoistened paper-for example, on Chinese or Japanese paper. The colors I use are those capable of being mixed with benzole and glycerin,which are neither those known as oil nor water colors and are such as are ordinarily used by those skilled in the art. The exact nature of the colors will be clear from the following further description of the process. The smearing or running of the colors when printing does not take place, because benzole is insoluble in water; but they are nevertheless not prevented from penetrating into the pores of the paper. After printing all the colors in thismanner I place the print in a bath of benzin, so that the benzole, which is involatile, is removed,whereby the colors will be still more closely combined with the paper. When the benzole has been removed, I remove the glycerin by dipping the print into a water-bath. A little alum is added to the water, so as to somewhat roughen the paper again. I then place the print while still moist into a press and impress the original plate-that is, that on which the drawing was engraved and etched in the first place over the colors. The print is now finished and has only to be mounted on cardboard or the like in the usual manner.

By removing the benzole and glycerin before impressing the original plate on the print the drawing is reproduced with great distinctness, as the print is only fully permeated with moisture when the benzole and glycerin have been removed.

What I claim, and desire to secure by Let ters Patent of the United States, is-

1. The process for producing colored etchings, which consists in etching the design as an intaglio-plate, then reproducing said design on the requisite number of stones or plates, the number corresponding to the number of colors used, then etching portions of the several stones or plates,as desired,to form relief-plates for printing the several colors, and subsequently printing the several colors from the corresponding relief stones or plates upon the paper or surface to be printed, and then after moistening the said paper or surface, printing the outlines and shadings by the said intaglio-plate, substantially as set forth.

2. The process for producing colored etchings, which consists in etching the design as an intaglio-plate, then reproducing said design on the requisite number of stones or plates, the number corresponding to the numlution of alum, and lastly printing the outber of colors used, then etching portions of lines and shadings by the said intaglio-plate, the several stones or p1ates,as desired,t0 form substantially as set forth.

relief-plates for printing the several colors, In testimony whereof I have hereunto set 5 and subsequently printing the several colors my hand in the presence of two Witnesses. 15

from the corresponding reliefstones or plates 7 upon the paper or surface to be printed, and BERNHARD MANNFELD' then moistening the printed sheets with ben- Witnesses: zin, drying them, and afterward moistening RICHARD GUENTHER, 10 the prints on the picture side With a weak so- JEAN GRUND.