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Collotype
Photographic printing process / From Wikipedia, the free encyclopedia
Collotype is a gelatin-based photographic printing process invented by Alphonse Poitevin in 1855 to print images in a wide variety of tones without the need for halftone screens.[1][2] The majority of collotypes were produced between the 1870s and 1920s.[3] It was the first form of photolithography.[4]
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