8 maio 1873 ano - 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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Data:
8 maio 1873 ano
Agora
~ 152 years ago