... used in bleaching kaolin clay, fur bleaching and reductive whitening, bleaching of bamboo products and straw products, 4. It is ... additive grade is used in foodstuffs, as bleaching agent and preservative dried fruits, dried vegetable, vermicelli, glucose, sugar ... sugar, caramel, candy, liquid glucose, bamboo shoots, mushrooms and canned mushrooms. Quality Standard: INDEX90%88%85%FOOD ADDITIVENa2S2O4≥90 ...