Why can't cinnabar fall off from ancient coins?

Cinnabar can't be removed from ancient coins because it sticks firmly after high temperature treatment. After the ancient coins are coated with ci

Why can't cinnabar fall off from ancient coins?

Cinnabar can't be removed from ancient coins because it sticks firmly after high temperature treatment. After the ancient coins are coated with cinnabar, they must be treated at high temperature so as not to fall off easily. Ancient coins refer to coins of ancient metals and their derivatives. Ancient coins include all kinds of coins in the pre-Qin period and all kinds of square hole coins after Qin and Han dynasties. The casting period of square hole coins lasted until the late Qing Dynasty and the early Republic of China. In fact, real money in the pre-Qin period, such as seashells in the Xia and Shang Dynasties, imitated shells (goods); Metal-weighed coins, such as copper blocks in the Western Zhou Dynasty, also belong to the category of ancient coins. Chinese ancient coins have a long history, a long history, various varieties and colorful colors, which are the treasures of China traditional culture.