中药由植物、动物、矿物共同组成,其中矿物类药材因质地坚硬,不易粉碎,不易煎出其有效成分,故配伍前大都需要经过火制法中之煅和淬后方能粉碎,粉碎后才易于煎出有效成分,但矿物中雄黄确不能用火煅制。古人曰:“诸石火煅红,雄黄忌火烧”。也有人说:“雄黄见火毒如砒(砒霜)。这种说法是有一定道理的。雄黄,又名熏黄、石黄、黄金石,其熟透者色 Traditional Chinese medicine is composed of plants, animals and minerals. The mineral herbs are hard to crush because they are hard and they are not easy to fry their active ingredients. Therefore, most of them need to be crushed after being forged and quenched in the fire method. The effective ingredients are decocted, but real yellow in minerals cannot be made by fire. The ancients said: “All the stones are calcined red, and the real yellow bogey fire.” Some people also said: "If you see a real yellow roar, such as arsenic, you have some truth. This realgar is also called smoked yellow, yellow stone, and golden stone.