Some herbs are not used internally. Whey, cow urine, rose water and milk are used for making these herbs pure and its use also alleviates the poisoning effects of these herbs. There is no need to purify its paste. First of all marking nut, poison nut, Alva, opium, nutmeg, sankhiya and Indian aconite are purified by a classical method. Thereafter these medicines should be used otherwise it may be harmful for life. It may be the cause of death too.