... Crystal Powder 4.50kgs in iron drums Sodium hydrosulfite 85%88%90%1) We are second biggest manufacturer ... Method: Sodium Formate Process3)Specifications:ItemsIndexTech GradeFood GradeNa2S2O4, % ≥85%88%90%85%Fe, ppm ≤202020---Zn, ppm ≤1111As, ppm ... and preservative dried fruits, dried vegetable, vermicelli, glucose, sugar, rock sugar, caramel, candy, liquid glucose, bamboo shoots, mushrooms and ...