“Vivex prints were introduced by Color Photographs Limited of London in 1928. One of the most important features of this printing method, invented by Douglas Arthur Spencer (1902–1980), was the introduction in 1929 of cellophane, instead of ...
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Pénichon, Sylvie (2013): Twentieth Century Colour Photographs. The Complete Guide to Processes, Identification & Preservation. London, Los Angeles: Thames & Hudson, p. 105.