Thin transparent , dark red scales , granules and brownish red powder. Solubility: very soluble in water, practically insoluble in ethanol (95%). Identification : passes the tests for identification (a) & (b) as prescribed in I.P. Limits : as per I.P. Arsenic: complies with I.P. Limit ( NMT 4 PPM Heavy metals (lead) : complies with I.P. Limit( NMT 30 ppm ) Zinc: complies with I.P. Limit ( NMT 50 ppm ) Chloride: complies with I.P. Limit ( NMT 0.25% ) Free ferric compound : passes the test as per I.P.