The best quality products and the most competitive price. Sodium Metabisulfite 64% Sodium metabisulfite is white ... crystalline powder or small crystals, with a strong smell of SO2, the proportion of 1.4, soluble in water, acidic aqueous solution, and ... acid contact with the release of SO2 and generates the corresponding salts, long home air, the oxidation into Na2S2O4, so the product can not go ...