Metakari (potassium metabisulfite)

Metakari (potassium metabisulfite) is a compound used as an antioxidant. In sake production, it is used to suppress the formation of black lees (kurokasu, dark discoloration of the sake lees). This name is the one used under the Food Sanitation Act, and labeling is required when it is used. In sake, metakari plays an important role in preserving quality and keeping the flavor from being impaired.