From printed paper new plates for reprinting
US 89715 A
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I tamaswat CHARLES vocr AND CHRIST-IANVOGT, OF NEW YORK, N. Y. LcttersPatent No. 89,715, dated M414; 4, 1869.
ammo!) or PRODUCING- FROM PRINTEDPAPER new PLATES ron REPRIN'I'ING.
The Schedule referred to in these Letters Patent and making part of the same.
To all whom it may concern:
Be it known that-we, CHARLES VOGT and Gnars'rmn VOGT, of the city, county, and State of New York, have invented a new and improved Method-0f Producing from Printed Paper New Plates for Reprinting; and we do hereby declare that the following is a full, clear, and ex ct description thereof, which will enable others skilled in the art to make and use the same.
The object of this invention is to devise a method for producing printing-plates from printed paper, so that, by means of such blocks, or plates, the design on the paper can be reproduced and reprinted on other paper or fabric.
By this method, old, valuable, and difficult engravings can, from single specimens, be transferred to metal plates, and be copied with great accuracy.
A new branch of industry will thus be established, and the productions of renowned artists will become accessible to all.
The following is a description of our new process.
The paper,' on which the design, to be re-engraved, is printed, is first steeped in mnriatic acid, which acts on the paper in such manner as to dissolve the ink, while it will make the white parts of the paper unfit to retain fatty matter, suchas paint or grease.
When the ink has been dissolved, the paper is placed upon a glass plate, with the printed surface outward, and its surface is dried, by means of a blotting-paper, while its under side is kept wet, by means of 'muriatic acid, interposed between the glass and paper. Thereby the white parts of the paper will be kept moist, to reject the paint, while the printed parts are, by. the dissolved ink, fitted to retain the paint.
The paint is composed of the following ingredients:
Five parts of tallow; three parts of lithographic ink; five parts of Venetian soap, and a very small quantity of sweet, or olive-oil.
' This paint is applied, to the surface of the-paper, with a brush, and is then washed off by holding the paper under a stream of water.
The paint will then leave the unprinted parts of the paper, but will adhere to those parts where printers ink had formerly been applied.
It will be exactly on the lines of the original de-. sign, and will form a true representation of the same on the paper.
When'somewhat dry, 80 that the paint on the pa per has a consistency of paste, a zinc plate is-presscd' upon the paper, and a portionof the paint will be transferred to its surface, representing the reverse of the design.
The paint onthe plate is then very gradually dried, in a moderate temperature, and is then cleaned, and
the plate slightly etched, by being drawn through diluted nitric acid.
' Gurn-arabic is then, by means of a soft roller, applied to the plate, and is allowed to remain for about two hours.
It will settle in the white parts, while'it will not affect the paint. The gum is then washed off. Some of it will, however, remain on the plate. That remaining prevents the paint from adhering to the nonpainted parts.
The paint, .next applied, consists of finely-powdered colophony and asphaltum paint. It only adheres on the paint formerly applied and not on the other parts.
The plate is now subjected to the action of nitric acid, which eats into the blank parts so as to raise the painted portions.
During the etching-process, the plate is heated over a moderate flame, so as to make the colophony melt,
to flow down on the sides of the raised parts, to prevent the acid from eating into the raised portions.v
An engraved, or, rather, etched plate, is thus produced, by which the original design may be recopied as frequently as may be desired.
The whole process will not take more than about three hours time.
Havingthus described .our invention,
We claim as new, and desire to secure by Letters Patent 1. Theherein-described process of transferring printed designs directly from paper to metal plates, for the Eng-pose of reprinting the same, substantially as speci- 2. Treating the paper in the manner specified, so that ,paint will only adhere to the printed portions, as set forth.
3. The composition for paint, to be applied to the paper, and to be transferred to the metal plate, as specified.
4. The composition for colophony paint, to be applied to the metal plate before etching, as set forth.
5. Heating the metal plate, during the etching-process, for the purpose of melting the colophony to prevent the acid from eating in a lateral'direction, as set forth.
CHRISTIAN voen Witnesses:
FRANK BLOOKLEY, ALEX. F. ROBERTS.