The difference between ancient mirror and modern mirror

In ancient China, the technology of glass (colored glaze) was very low, because the temperature was not enough, the glass could not be purified and made transparent. Therefore, in ancient China, the reflective effect of metal was usually used as a mirror. Most of them are bronze mirrors, which are often used because of their wear resistance and better reflective performance. In China, there is a very traditional and ancient occupation called "mirror grinder", which means that bronze mirrors are easily oxidized by metals, and will be blurred after being dyed, which requires people to polish them again. This occupation existed in inland areas until the Republic of China. Western glass mirrors originated in Italian glass manufacturing industry, about14th century. It was introduced to China in the Ming Dynasty and became popular in the Republic of China.