Also known as: stannous citrate, disodium English name: Sodium stannous Molecular weight: 370.79, molecular formula: C6H6O8SnNa2 
 Properties: white crystal. Was strongly reducing. Deliquescence, easily soluble in water. Susceptible to oxidation. Anti-corrosion and protect the color. . 
 Limited: GB 2760-96: mushrooms and fruits and vegetables, canned 0.3g/kg; general canned mushrooms paint, the amount of 0.02% to play a protective role. General paint cans plus 0.06%