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Prizma II

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“In its final form Prizma made use of duplitized positive film. As in previous Prizma systems, the original negatives were alternate frame sequential exposures. The Prizma negative was printed on both sides of the positive film in a special printer. After developing in a normal black and white developer it was bleached in a bath that converted the two images to silver iodide. Two methods appear to have been used for dyeing the duplitized prints:

1. The film was wound tightly on a drum and the exposed side was dyed. When this step was completed, the film was dried and reversed onto a second drum and dyed the other color.10

2. The print was coated with a removable resist on the side printed from the blue-green negative. The red-orange negative side was then dyed blue-green. When the dyeing was completed the resist was removed and the film was dried. Next the red-orange side was coated with resist and the other side of the print was dyed red-orange.”

(Ryan, Roderick T. (1977): A History of Motion Picture Color Technology. London: Focal Press, pp. 91-94.)








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