It is preferable to use an earthen jug or pot, and then comes the enamelware or aluminum product. But iron or copper wares are forbidden because some drugs, when heated together with iron or copper, may generate sediment, lower solubility or even lead to chemical reaction and side effect. It is also advisable to use a pot with large capacity so as to provide a favorable condition for boiling up drugs without boiling over, accelerating the extraction of active constituents. Besides a lid is necessary to prevent water from evaporating too fast, which is not good for the complete extraction of active constituents.
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