Industrial Grade Chromaticity/in hazen unit: 20(Hazen) max Phosphoric Acid (H3PO4): 85% min Chloride (as Cl-): 0.0005% max Arsenic (as As): 0.0005% max Iron (as Fe): 0.002% max Sulphate (as SO42-): 0.005% max Heavy metals (as Pb): 0.001% max Colorless, transparent and syrupy liqid Food Grade: Chromaticity/in hazen unit: 20(Hazen) max Phosphoric Acid (H3PO4): 85% min Oxidable as (H3PO3): 0.012% max Chloride (as Cl-): 0.0005% max Fluoride (as F): 0.001% max Arsenic (as As): 0.0001% max Iron (as Fe): 0.002% max Sulphate (as SO42-): 0.005% max Heavy metals (as Pb): 0.0005% max Colorless, transparent and syrupy liqid