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 ...

Agfachrome CU 410

Subtractive 3 color: dye destruction process, silver dye-bleach, still photography
“Between 1970 and 1976, Agfa-Gevaert produced its own silver dye-bleach printing material on a white-pigmented acetate base called Agfachrome CU 410.28 Only available to a few photofinishers in Germany, it was used to print amateurs’ ...

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Cibachrome 1963, after 1991 renamed Ilfochrome

Subtractive 3 color: dye destruction process, silver dye-bleach, still photography
“The materials and processes described thus far have been either unsuccessful or short-lived for one reason or another; the trend changed with the launch of Cibachrome in the 1960s. The product and its subsequent forms dominated the silver ...

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Gaspar Color subtractive 2 color

Subtractive 2 color: Silver dye-bleach

Gasparcolor OR Gaspar Color

Subtractive 3 color: Silver dye-bleach multilayer print film

Gasparcolor was the first three-color multi-layer monopack film available for practical use. It was a double-coated print film with a cyan layer on one side and two layers dyed magenta and yellow on the other side (see illustrations).

398 Images in 24 Galleries

Katachromie

Subtractive 3 color: Monopack silver dye-bleach, still photography
Karl Schinzel proposed a multi-layered monopack for still photography, based on the principle of the dye-bleach process which was later elaborated to a practical application with Gasparcolor.

Silver dye-bleach

Subtractive 3 color: Dye-bleach
“Probably the first use of the catalytic property of silver was in 1889, when E. Howard Farmer disclosed the action of a silver image upon strong dichromate solutions (Eng. P. 17773/89). When a plate or film, containing a silver image, is immersed ...