Potassium Metabisulphite

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Potassium Metabisulphite K2S2O5

Used as a preservative in developers
Used in place of sodium sulfite in some developers, particularly in two-solution formulas where the increased acidity of the metabisulfite inhibits oxidation. For acidifying fixing baths.
Used as a clearing agent in platinum palladium printing and in New Chrysotypes