AGFA BIPACK FILM
The front film is orthochromatic and sensitive, therefore, to green and blue. The rear film is panchromatic and records red-orange only, there being a red-orange filter on the orthochromatic emulsion. In fact, this is a bipack of the ...
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Source: Klein, Adrian Bernhard (Cornwell-Clyne) (1940): Colour Cinematography. Boston: American Photographic Pub. Co.