It includes mild fire and strong fire, by the latter is meant quick decocting and by the former slow decocting. Usually strong fire is used until the water boils, followed by mild fire for certain duration. Besides the choice of fire base on the drug property and time needed. Strong fire is preferable for drugs with the function of relieving exterior syndrome and promoting diuresis, which are decocted short time and in relatively small amount of water. However, mild fire is advisable for drugs with nourish function, which are decocted for longer time and in amount of water. In case drugs are burnt, they should be discarded to prevent harmful reaction.
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