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Eliminating fire toxin
去火毒 〔去火毒〕 qù huǒ dú
A method of treatment used to remove irritants from medicinal plasters. Plasters applied to the skin immediately after preparation can cause irritation to the skin that in mild cases results in itching and, in severe cases, in blistering and erosion. This irritation is traditionally attributed to fire toxin.
Fire toxin is removed by one of two methods: storing for long time out of direct sunlight; and soaking in cool water for several days. The latter method is more practical.