Sodium metabisulfite

Sodium metabisulfite
Is used as an acidifying agent in acid fixing baths.
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Sodium metabisulfite - used as an acidifying agent in acid fixing baths.
Sodium sulfide - chemical used in sulfide (sepia) toning.
Sodium sulfite - chemical commonly used as a preservative in many developing solutions.

See also: Fixing bath, Fixing, Oxidation, Opaque, Reduction