Agfa bipack films

Subtractive 2 color: Bi-pack
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 ...

11 Images in 1 Gallery

3M Posi-Tone

Subtractive 3 color: dye destruction process, silver dye-bleach, still photography
“In 1956, after the failure of the French venture, Gaspar resumed his own production of printing materials and chemicals (Koshofer 1981a). In the late 1950s he entered into an agreement with 3M Company of St. Paul, Minnesota, to explore the ...

3M Color Positive, type 651

Subtractive 3 color: Chromogenic monopack

3M Color Positive, type 650

Subtractive 3 color: Chromogenic monopack

3M Color Positive Film

Subtractive 3 color: Chromogenic monopack

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