monoclinic crystal,used in fixers, plating, leather, reductant, dechlorinating agent. Item Photo gradeTech gradeAnhydrous gradeAppearancecolorless transparent crystal colorless transparent crystal white powderAssay≥99.00%≥98.5%≥98.0%Water Insoluble matter ≤0.01%≤0.03%≤0.03%Sulfide≤0.001%≤0.003%≤0.001%Fe≤0.001%≤0.003%≤0.001%PH value6.5-9.56.5-9.56.5-9.5Granularity12-16----