“The Dutch Sirius Color process (1929) used a camera with a beamsplitting system behind the lens to expose a single film, the film passing through two gates at right angles to each other. The double-coated print film was dye-toned. The process was demonstrated in London early in 1930 but was used only for a few shorts and advertising films.”

(Coe, Brian (1981): The History of Movie Photography. Westfield, N.J.: Eastview Editions, p. 129.)

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Original Technical Papers and Primary Sources

Anonymous (1924). In: Lichtbild-Bühne, 22, Aug. 17, 1924, p. 14.

Specht, K. von (1930): Vortragsreferat über den Sirius-Farbenfilm. In: Filmtechnik, 6,9, p. 19.

Specht, K. von (1930): Die Entwicklung des Sirius-Farbenfilm-Verfahrens (Vortrag). In: Die Kinotechnik, 12,10, May, pp. 276–278. (in German) View Quote

Secondary Sources

Alt, Dirk (2011): “Der Farbfilm marschiert!” Frühe Farbfilmverfahren und NS-Propaganda 1933-1945. München: Belleville, on pp. 47–48 View Quote, on pp. 73–74 View Quote, on p. 76 View Quote, on p. 91 View Quote, on p. 117 View Quote and on p. 310. (in German) View Quote

Coe, Brian (1981): The History of Movie Photography. Westfield, N.J.: Eastview Editions, on p. 129. View Quote

Eggert, John (1932): Kurzer Überblick über den Stand der Farbenkinematographie. In: Bericht über den VIII. Internationalen Kongress für wissenschaftliche und angewandte Photographie, Dresden 1931. Leipzig: J. A. Barth, pp. 214–221, on pp. 215–218. (in German) View Quote

Klein, Adrian Bernhard = Cornwell-Clyne (1940): Colour Cinematography. Boston: American Photographic Pub. Co. 2nd revised edition, on p. 219. View Quote

Koshofer, Gert (1966): Fünfundzwanzig Jahre deutscher Farbenspielfilm. In: Film – Kino – Technik, 20,10, 1966, pp. 259-262, on p. 259. (in German) View Quote