sodium metabisulfite In the manufacture of chloroform, solasulfone and benzaldehyde; as coagulator in rubber industry; as dechlorinating agent and cooking auxilairy in cotton fabrics; used in leather treatmetn in tanner industry; in the manufacture of hydroxycitronellal and hydroxylamine; as developer; as bleaching agent, preservative, anti-oxidant in food industry. As per GB2760-86, use level for fruit wine is 0.25g/kg max.; for wine, sugar, bamboo shoot is 0.45g/kg max.; Residues(SO2) in bamboo shoot and mushroom: 0.025g/kg max.; in fruit wine and sugar: 0.05g/kg; for others: 0.1g/kg max