SPECIFICATIONS Appearance: Green yellow crystal Na3Fe(C2O4)3.5H2O: 99.0% Undissolved substance: 0.025 Max Iron (Fe): 11.5 - 12.2% Chloride (Cl): 0.005% Max Heavy metals (Pb): 0.005% Max Loss on drying: 0.2% Max pH 10g/L, 25: 4.0 - 5.5