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Appearance White Fine Powder Assay 99.0% Mesh Through 300 Mesh Arsenic(As) 3PPM Heavy Metals(Pb) 10PPM Residue On Ignition 0.1% Water 0.3% Maleic Acid 0.1% Colour(Pt-Co) 15HAZEN Dss 0.3% Melting Point 286~289 Solubility(25 ) 1.00g/100ml water