The color of Hetian jade is divided into primary color and secondary color. The primary color refers to the color that appears when Hetian jade is mineralized. It is colored by mineral composition. The secondary color is the color that is expressed by the external force. Hetian jade is different in source according to external force. Hetian jade secondary color can be divided into natural secondary color and artificial secondary color. The formation of secondary colors includes the following cases: 1. Hetian jade is naturally oxidized in the air. This is a natural secondary color. When jade is exposed to the air, it will undergo oxidation and color change. The oxidation process of jade is very slow. It often changes obviously for hundreds of years. Some people have concluded that jade often needs to be It will be colored for about five hundred years after being stored in a natural state. The natural oxidation of Hetian jade is also related to the fine density of jade material. The more tough and fine the texture, the less obvious the oxidation. On the contrary, the loose material is easy to oxidize. 2. The color change of Hetian jade in the tomb. The color change of Hetian jade during the funeral process is artificial secondary color. The reasons for the secondary color formation include underground temperature and humidity, as well as underground minerals, chemical composition of burial objects, etc., which the ancients called "twilight". The image vividly illustrates the reason for this color formation. 3, artificial disk play. After Hetian jade is made into jade, the long-term playing of the person will make the gloss more delicate and warm, and the transparency is stronger, which also makes the color change. Especially the unearthed ancient jade, after the play, the color changes even more. 4. Artificial dyeing. Many Hetian jade colors are not perfect, and in order to sell good prices, the jade color is often improved by dyeing, and the dyeing is the common method for making old jade or jade. Dongguan Shengqiang Electronic Co.,Ltd , https://www.sqoptical.com