Collotype

Early collotype postcard; 1882 in Nuremberg, signed by J. B. Obernetter
Postcard of the "Alte Oper" in Frankfurt, about 1900.

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]

  1. ^ "The Poitevin Patents and the Importance of Using Primary Sources". BrevetsPhotographiques.fr. Archived from the original on 2013-02-13.
  2. ^ Jones, Bernard Edward. Cassell's cyclopaedia of photography. Ayer Publishing.
  3. ^ "Photographic processes". Victoria and Albert Museum. Archived from the original on 2019-07-21. Retrieved 2021-01-20.
  4. ^ "Collotype". Society of American Archivists Dictionary. Society of American Archivists. Archived from the original on 2021-05-02. Retrieved 2021-11-12.