In clinical practice, aged moxa is used instead of new moxa. The ancients had the saying of seeking three years of moxa for seven years of illness, and the Ming Dynasty doctor Li Shizhen also pointed out that it is better to use aged moxa leaves for a long time, so moxibustion needs to use aged moxa, which has been repeatedly emphasized by doctors for generations. The color of aged moxa is generally earthy yellow or golden yellow, and the advantages of aged moxa are that it contains less volatile oil, burns slowly, has a milder fire, and has less smoke and less ash when it burns. The color of new moxa is generally greenish yellow, which has a strong smell, contains more volatile oils, burns quickly, and has a strong fire, smokes more after burning, and the moxa ashes fall off easily and hurt the skin and clothing.