The Kodachrome process was invented in 1913 by John G. Capstaff for still photography and subsequently adapted to motion pictures. For the process two frames were advanced simultaneously, one located above the other. The light passed either through two lenses or through a beam-splitter, fitted with red and green filters. The release print was exposed through a beam-splitter whereby the alternate frames were projected onto either side of double-coated stock. After development by a usual b/w process, the film was tanned to harden the exposed areas. The soft areas were dyed red-orange and blue-green respectively.
Pénichon, Sylvie (2013): Twentieth Century Colour Photographs. The Complete Guide to Processes, Identification & Preservation. London, Los Angeles: Thames & Hudson, p. 148.
Kodacolor lenticular filter for the projector. Lichtspiel / Kinemathek Bern.
Two-Color Kodachrome Print (USA ca. 1925 to 1927, Anonymous). Credit: George Eastman Museum. Photographs of the Kodachrome two-color double coated stock from 1925 and 1927 by Olivia Kristina Stutz, ERC Advanced Grant FilmColors.
La perception et l'imaginaire (FRA 1964, Éric Duvivier). Credit: Image'Est. Photographs of the Kodachrome II camera material by Bregt Lameris, ERC Advanced Grant FilmColors.