8 Mai 1873 Jahr - Photogravure is a photographic technique used with aquatint. The metal plate is heated and dusted with a fine rosin for an aquatint ground. In a darkroom, the image is exposed from a photo positive transparency onto a sensitised gravure carbon tissue or film. This image, in turn, is transferred to the metal plate.
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8 Mai 1873 Jahr
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~ 152 years ago