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Sodium Metabisulphite
Sodium metabisulfite or sodium pyrosulfite (IUPAC spelling; Br. E. sodium metabisulphite or sodium pyrosulphite) is an inorganic compound of chemical formula Na2S2O5.
sometimes referred to as disodium metabisulfite. It is used as a disinfectant, antioxidant, and preservative agent.