Tin is a metal element, an inorganic substance. White tin in common form is a low melting point metal with silver-white luster. It is divalent or tetravalent in compounds and will not be oxidized by air at room temperature. It is mainly Dioxide (cassiterite) and various sulfides (such as sulphur cassiterite) exist in the form. Tin is one of the famous "hardware"-gold, silver, copper, iron and tin. As early as in ancient times, people discovered and used tin. In some ancient tombs in our country, some tin pots and tin candle holders are often found. According to textual research, the use of tin ware was very common in my country during the Zhou Dynasty.