“Public showings of the work done at this plant in Hollywood have been given to Los Angeles audiences.
The release prints are made on double sided film. Both sides are developed at one time and then toned red on one side and bluegreen on the opposite side. The tones are two-bath metallic colors from iron and uranium. The negatives are made with the film pack system of two films emulsion to emulsion in the camera. The front film carries a surface color of red-orange which acts as a filter to the back panchromatic film. The front film is not sensitive to red.”
(Report of Color Committee. In: Journal of the Society of Motion Picture Engineers 15, 1930, pp. 721-724, pp. 721-722.)
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Original Technical Papers and Primary Sources
Society of Motion Picture Engineers (1930): Report of the Color Committee. In: Journal of the Society of Motion Picture Engineers, 15, Nov. 1930, pp. 721-724, on pp. 721-722.
Alt, Dirk (2011): “Der Farbfilm marschiert!” Frühe Farbfilmverfahren und NS-Propaganda 1933-1945. München: Belleville, on pp. 43–44. (in German)
D’haeyere, Hilde (2013): Technicolor – Multicolor – Sennett-Color. Natural Color Processes in Mack Sennett Comedies 1926-1931. In: Simon Brown, Sarah Street, Liz Watkins (eds.): Color and the Moving Image. History, Theory, Aesthetics, Archive. New York, London: Routledge, pp. 23–36.
Klein, Adrian Bernhard = Cornwell-Clyne (1940): Colour Cinematography. Boston: American Photographic Pub. Co.. 2nd revised edition, pp. 218-219.
Ryan, Roderick T. (1977): A History of Motion Picture Color Technology. London: Focal Press, p. 98.
Society of Motion Picture Engineers (1930): Report. Progress in the Motion Picture Industry. In: Journal of the Society of Motion Picture Engineers, 15, December 1930, pp. 791–793, on pp. 792.