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Pénichon, Sylvie (2013): Twentieth Century Colour Photographs. The Complete Guide to Processes, Identification & Preservation. London, Los Angeles: Thames & Hudson, p. 134.
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.
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).
“In 1898 William Friese-Greene, a professional portrait photographer by trade, demonstrated in London ‘the first process of true natural-color cinematography.’ His program consisted of ‘a series of animated natural-color pictures,’ and although this demonstration aroused considerable interest at the time, Friese-Greene was unable to exploit this system on a profitable basis. Undaunted, he eventually developed a total of four different color methods.”
Frame characteristics / features of margins: Ambrosio. Cf.: Brown, Harold (1990): Physical Characteristics of Early Films as Aids to Identification. Brussels: FIAF, on p. 24.