may 8, 1873 - 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.
Added to timeline:
Date:
may 8, 1873
Now
~ 153 years ago