Chemical Specifications Appearance White or almost white, crystalline powder or colourless crystals. Assay (argentometric) 98.0-100.5% Appearance of solution Passes test Identification Passes test Acidity or alkalinity Passes test Bromate (BrO3) (as per pharma) Passes test Chloride (Cl) Max 0.6% Iodide (I) (as per pharma) Passes test Sulphate (SO4) Max 0.01% Iron (Fe) Max 0.002% Heavy metal (as Pb) Max 0.001% Magnesium and alkali earth metals (as Ca) Max 0.02% Loss on drying (at 105°C; 4 hrs) Max 1.0%