What is the black skin in Hetian jade?

The black skin in Hetian jade is due to the infiltration of foreign dark minerals such as iron and manganese into the jade, especially where the jade is loose or cracked, and slowly deposits, and finally forms a layer of dark skin, which is called "black skin".

Generally speaking, the darker the skin color of seed material, the longer the survival time. It is also for this reason that the skin of black seed material is thicker. Hetian jade black seed material is more valuable.

Extended data:

Black-skinned seeds are rarely pure black. A piece of seed material is often mixed with other colors, such as red, yellow, autumn pear and other skin colors. The skin of black leather material is very thick, and there are few thin skins. So in the past, many jade sculptors would remove the black skin and dig it out, leaving cooked meat. Now the black leather material is gradually sought after by the market, especially the first-line dark leather material.

The seed material with black skin has good texture because it lives for a long time or grows in a better geographical environment. Its humidity and oiliness are very good. In addition, some other seed materials can be seen in the market, the color is not very pure, and there will be some impurities more or less.

Hetian jade black seed material is pure in color, and no other colors are mixed. Therefore, for some senior players of Hetian jade seed material, black seed material is a kind of original stone with great collection value.