Steaming, boiling, and two ways of dunking hot ingredients in cool water (one after boiling, one after heating), are the p'ao-chih which combine both fire and water.
水蛭、虻蟲等看來很嚇人的藥材，就直接放入鍋內，隔紙用微火焙制，待表面微黃、內部乾燥為止，即為「焙法」。炮製可減毒性增療效蒸法、煮法、燀法及淬法，是經由水火共同加熱炮製，所以稱為「水火共製蒸法」。