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
Picture is illustration only.
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