Oxidation product

Oxidation product .
The chemical produced by a colour developer during the conversion of exposed silver halides to black metallic silver
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The preservative prolongs the useful life of the developing solution and prevents stains caused by the formation of colored oxidation products.

For a while we suspected that the dark brown oxidation product of metol was the causative agent.

-Chromogenic development - process in which the oxidation products of development combine with color couplers to form dyes during processing.
-Chromogenic materials - color photographic materials which form dyes during processing.

See also: Developer, Oxidation, Silver, Image, Silver halide