Appearance A clear colorless liquid Assay 69 - 70.0% Colour scale Max 10 APHA Weight/ mL at 20°C 1.41 - 1.42 g Residue on ignition Max 0.0005% Chloride (Cl) Max 0.00005% Phosphate and silicate (as SiO2) Max 0.0001% Sulphate (SO4) Max 0.0001% Arsenic (As) Max 0.000001% Copper (Cu) Max 0.00001% Iron (Fe) Max 0.00002% Heavy metal (as Pb) Max 0.00002% Manganese (Mn) Max 0.00004%