Triadochrome
Description
“After the war, in 1921, J. F. Shepherd introduced in England a printing method called the Triadochrome Color Process, which was very similar to Hamburger’s Polychromide.10 To make a print, a cyan impression obtained from an iron-toned bromide transfer printing material was squeegeed and transferred onto a developed magenta carbon relief on a sheet of celluloid. The yellow impression was made on an ordinary bromide paper and toned yellow, and this was in turn squeegeed onto the celluloid. The sandwich was allowed to dry, and when complete the celluloid support was stripped, leaving a colored image on paper (Wall 1922). It seems that the process did not meet with great success as there is no mention of it in photographic journals after 1922.”
(Pénichon, Sylvie (2013): Twentieth Century Colour Photographs. The Complete Guide to Processes, Identification & Preservation. London, Los Angeles: Thames & Hudson, on p. 280.)
Secondary Sources
Pénichon, Sylvie (2013): Twentieth Century Colour Photographs. The Complete Guide to Processes, Identification & Preservation. London, Los Angeles: Thames & Hudson, on p. 280 View Quote and on pp. 278–289. View Quote
