Other names: Sodium pyrosulfite, Sodium metabisulfite, SO2 58.5% min, Disodium disulphite,
Sodium metabisulphite gr,
Sodium pyrosulphite, Sodium disulfite
Appearance White crystalline powder with a sulfur smell Uses 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. Chemical Formula Na2O5S2 Notes Can be substituted weight for weight with sodium bisulfite
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