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 ...

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.

Gasparcolor OR Gaspar Color

Subtractive 3 color: Silver dye-bleach multilayer print film
Gasparcolor was the first 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 image). As a consequence of this ...
  • Kreise (1933-34)

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Gaspar Color subtractive 2 color

Subtractive 2 color: Silver dye-bleach