“In 1951, when pigment processes were falling into disfavor, Pierre Fresson (1904–1983) of Atelier Fresson developed Fresson Quadrichromy, a four-color printing method based on the monochrome direct carbon process (charbon-satin) that had ...
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Pénichon, Sylvie (2013): Twentieth Century Colour Photographs. The Complete Guide to Processes, Identification & Preservation. London, Los Angeles: Thames & Hudson, p. 91.
