- When it is known or suspected that saccharine or other matter, of such a nature as to prevent the true strength being ascertained by means of the hydrometer, is present in spirit, duty be calculated on the quantity and strength of such spirit as ascertained before the introduction of such matter. No allowance shall be made for wastage in such spirit after the addition of such matter and before removal from the distillery. Such spirit shall be kept in a separate receptacle.