... Appearance: white or light yellow crystalline powder anhydrous sodium sulfiteanhydrous sodium sulfite1.Grade: food grade2.purity: 97%Min3. ... Appearance: white or light yellow crystalline powderCompany standard Item Value sodium sulfite (Na2SO3), mass fraction /% ≥ 97.0 Fe, ... ), mass fraction /% ≤ 0.0002 Clarity Passed Chinese standardItem Value sodium sulfite (Na2SO3), mass fraction /% ≥ 96.0 Fe, mass ...