1. high pure grade, photo grade, industrial grade 2. SGS, BV, certifiacte of origin 3. the special manufacturer Anhydrous Sodium Sulfite packing: 25kg plastic woven bag Property: white crystalline powder, with the smell of sulfur dioxide, soluble in water, slight soluble in alcohol, insoluble in liquid ammonia. Application: in printing and dyeing use as antichlor, bleaching agentin paper making ...