Section 16 in Punjab Poisons Possession and Sale Rules, 1966
16.
A licence holder shall not sell powdered white arsenic to any person unless the same is before the sale thereof mixed with soot, indigo or prussian blue in the proportion of half an ounce of soot, indigo or prussian blue at least to one pound of the white arsenic and so in proportion for any greater or less quantity :Provided that where such arsenic is stated by the purchaser to be required for some purpose for which such admixture would, according to the representation of the purchaser, render it unfit such arsenic may be sold without such admixture in a quantity of not less than ten pounds at any one time.
