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Photolithography by Obernetter

An early PHOTOMECHANICAL process used successfully in Germany, ca. 1880s. Somewhat similar to the COLLOTYPE process. A DICHROMATED gelatin coating, exposed behind a negative, was covered with an impalpable metallic zinc powder. The plate after this operation was heated to a temperature of 200°C. It was then submitted to the action of a very weak solution of hydrochloric acid, and then well washed. The parts of the gelatin covered with the metallic powder could be more or less damped and therefore refused the greasy ink, while those free from the zinc received it. (Nadeau, Encyclopedia, p. xxx.).

PhotolithographOber_512w8x6 Photolithograph. J. Obernetter, Munich. "Ca. 1885" penciled on the back. Image slight brown, matte, screenless, 143x100 mm, card trimmed 151 x 100 mm

Photolithograph. J. Obernetter, Munich. “Ca. 1885” penciled on the back. Image slight brown, matte, screenless, 143  x 100 mm, card trimmed 151 x 100 mm.