Gasparcolor was the first three-color multi-layer monopack film available for practical use. It was a double-coated print film with a cyan layer on one side and two layers dyed magenta and yellow on the other side (see illustrations).
Coloring of individual frames by the use of very fine brushes. The process was previously applied to lantern slides. Any water based translucent dye was suited for the process, most often the coloring was done with acid dyes.
Pénichon, Sylvie (2013): Twentieth Century Colour Photographs. The Complete Guide to Processes, Identification & Preservation. London, Los Angeles: Thames & Hudson, p. 245.
Source: Pénichon, Sylvie (2013): Twentieth Century Colour Photographs. The Complete Guide to Processes, Identification & Preservation. London, Los Angeles: Thames & Hudson, p. 235.
Uit het rijk der kristallen (NDL 1927?, J.C. Mol). Credit: EYE Film Museum. Photographs of the Dufaycolor and Gasparcolor nitrate print by Barbara Flueckiger.
Credit: Cinémathèque française, conservatoire des techniques, Paris.
Comparing cross section schemes of different Gevachrome types. Scource: Verbrugghe, R. G. L. (1967): A Sharp Reversal Color Print Film. In: Journal SMPTE, Vol. 76, Dec. 1967, p. 1198.
Loïe Fuller (FRA 1905, Anonymous). Credit: BFI National Archive. Photographs of the hand colored nitrate print by Olivia Kristina Stutz, ERC Advanced Grant FilmColors.
Black-and-white with Handschiegl in Lights of Old Broadway (USA 1925, Monta Bell). Credit: Library of Congress. Photograph of the nitrate print by Barbara Flueckiger.
Credit: Technicolor Collection. George Eastman House Moving Image Department. Photograph by Barbara Flueckiger.