... coloring matter and chemical industries,printing and dyeing industries,medicine,pear making industries Grade 1Grade 2Grade 3Grade 4Sodium Sulfite, Content (Na2SO3) %>=97 ... product is used as the reducer of coloring matter and chemical industries,printing and dyeing industries,medicine,pear making industries and ... :in net 50kg plastic woven bag with inner bag. Sodium Sulfite, Anhydrous