Appearance white powder accordance Assay(C4H6O6) >=99.5 99.9% Melting point 200-206 205.0-205.5 As mg/kg <=2 <2 Heavy metals Pb mg/kg <=10 <10 Residue on ignition <=.0.10 0.04 Loss on drying <=0.50 0.03 Sulfate test <=0.04 <0.04 Readily oxidizable substances accordance accordance