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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.
During the capturing of the film a beam-splitter in combination with filters in the camera divided the incoming light into a red and a green separation negative on black-and-white stock. When projected in the cinema the two images were combined simultaneously by additive mixture through corresponding red and green filters into one picture consisting of red and green colored light. The reduction of the whole color range to two colors (and their additive combinations) was necessary because of the complex optical arrangement.
The first subtractive 2 color process introduced by Technicolor captured the incoming light through a beam splitter with red and green filters also. However, in contrast to the first Technicolor process, the two b/w images were recorded on one negative strip. This was achieved by the pull-down of two frames simultaneously, a process that required the double speed in the camera. These two frames were arranged in pairs, whereby the green record was inverted up-side down (see image).
Pénichon, Sylvie (2013): Twentieth Century Colour Photographs. The Complete Guide to Processes, Identification & Preservation. London, Los Angeles: Thames & Hudson, p. 134.
Magnification. Source: Coe, Brian (1978): Colour Photography. The First Hundred Years 1840-1940. London: Ash & Grant.
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.
Source: Ryan, Roderick T. (1977): A History of Motion Picture Color Technology. London: Focal Press. Credit: Illustration by Sarah Steinbacher, Multimedia & E-Learning-Services, University of Zurich.
The beam-splitter prism. Source: Coote, Jack H. (1993): The Illustrated History of Colour Photography. Surbiton, Surrey: Fountain Press.
Credit: Illustration by Sarah Steinbacher, Multimedia & E-Learning-Services, University of Zurich. Source: Ryan, Roderick T. (1977): A History of Motion Picture Color Technology. London: Focal Press.
Knowing Men (GB 1930, Elinor Glyn), negative. Credit: Courtesy of BFI National Archive. Photograph by Barbara Flueckiger.
Source: Ryan, Roderick T. (1977): A History of Motion Picture Color Technology. London: Focal Press.
Polychromide samples from the Kodak Film Samples Collection at the National Science and Media Museum in Bradford.
Credit: National Science and Media Museum Bradford.
Photographs by Barbara Flueckiger in collaboration with Noemi Daugaard.
The two colors visible at a splice. Credit: EYE Film Institute Amsterdam. Film: [Kleurenpracht].
Credit: Cinémathèque française, conservatoire des techniques, Paris.
Source: Pénichon, Sylvie (2013): Twentieth Century Colour Photographs. The Complete Guide to Processes, Identification & Preservation. London, Los Angeles: Thames & Hudson, p. 103.
Russian Ideas in Clothes! (USA 1922). Credit: UCLA Film & Television Archive. Photographs of the nitrate print by Barbara Flueckiger.
Credit: Cinémathèque française, conservatoire des techniques, Paris.
The Phantom of the Opera (USA 1925, Rupert Julian). Credit: UCLA Film & Television Archive. Photographs of the nitrate print by Barbara Flueckiger.
Source: Pénichon, Sylvie (2013): Twentieth Century Colour Photographs. The Complete Guide to Processes, Identification & Preservation. London, Los Angeles: Thames & Hudson, p. 73.
Credit: George Eastman House Motion Picture Department Collection. Film: The Old Family Toothbrush (USA 1925).