Description Ferrous Chloride Tetrahydrate, Reagent, 99+%, 500g For Research & Development Not for drug, human, animal, or food use Specifications:Appearance (Color) Pale green to light brown Appearance (Form) CrystalsAssay 99+%Assay (as FeCl2) 62.5-66.0%Arsenic <0.001%Copper <0.005%Zinc <0.005%Phosphate <0.01%Sulfate <0.01%Insoluble Matter <0.01% CAS: 13478-10-9 FORMULA: FeCl2•4H2O