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Sodium pyrosulfite Sodium metabisulfite, SO2 58.5% min Disodium disulphite Sodium metabisulphite gr Sodium disulphite~Sodium pyrosulphite Sodium disulfite
White crystalline powder with a sulfur smell
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.
Can be substituted weight for weight with sodium bisulfite