... kinds of grade:1) Common grade with natural color2) Pigment grade3) Low hexavanlent chrome grade4) High purity grade5) ... GREENChemical Name: Chrome OxideFormula: Cr2O3Molecular weight: 151.99Appearance: green powder,insoluble in water, density is 5.12,Usages: ... or buidingmaterial, also used formaking sun-proof coating,abrasive,green polishingcompound and special printing inkfor printing bank note, ...