... 5.21 g/ml. TEST ITEM UNIT SPECIFICATIONS RESULTSPURITY % 99.05% 99.2%MOISTURE % 0.20% 0.1%WATER SOLUBLE ... % 0.1% 0.05%Cr+6 PPM 5PPM 3PPMUsage: Pigment,paint,glass,building ceramic colorants,printing-ink,chrome plating,chromium metal production ... ,fire-proof materials,etc. Chrome Oxide Green (pigment)