... ,printing and dyeing industries,medicine,pear making industries Grade 1Grade 2Grade 3Grade 4Sodium Sulfite, Content (Na2SO3) %>=97.096.093.096.0Ferro(Fe ... ,printing and dyeing industries,medicine,pear making industries and food fresh.Packing:in net 50kg plastic woven bag with inner bag. Sodium Sulfite, Anhydrous