What are the characteristics of B-grade jadeite?

B-grade jadeite refers to jadeite with poor quality and color that has been corroded by strong acids and alkalis to become jadeite with beautiful appearance and no impurities. Simply put, B-grade jade is jade with fake water and fake species.

Due to the corrosion by chemical reagents, the chemical structure of B-grade jadeite is damaged and the connectivity between its grains is reduced. In order to cover and make up for these flaws, the makers will fill it with gum. Over time, the glue injected into jade B loan will age and crack, losing its lustre, so it has no value-preserving function.

The specific gravity of B-grade jadeite is less than 3.3, and the refractive index is greater than or less than 1.66. Under a high-power microscope, it can be seen that the glue injection of B-grade jadeite has formed a small, smooth, orange peel structure with a resin luster and residual bubbles, which have extremely weak reflections and appear cloudy. The bracelet is hung up with a thin wire and tapped lightly with an iron nail, making a hoarse sound.

Processing technology of B-grade jadeite

Depending on the quality of jadeite, the processing of B-grade jadeite can be divided into two types: gluing and not gluing.

The gluing process is to use resin glue to consolidate jade B-loan products to increase their strength and transparency. The process is to heat the B-grade jade products (temperature 500-6009T), then corrode them with strong acid, wash them with clean water, dry them, vacuum them, apply glue, and then post-process the appearance before finally taking them out of water. Most of the glue treatments are for jade products with considerable thickness. It can be performed on jade of all textures, but jade with chemical base, bean ground, and taro ground are the most common. After applying glue, the glue-like substance fills the pores inside the jade. In recent years, the industry has mostly used organic wax for gluing. The effect of organic wax is better than traditional white wax, but it cannot solve the problem of dull surface gloss of B-grade jadeite after gluing. Over time, the surface of B-grade jadeite after gluing will still crack.

The non-glue treatment refers to the treatment method of corroding B-grade jade products with strong chemical acids, then washing them with clean water and directly draining them out of the water. The non-glue treatment is generally applied to jade slices of good quality or hollow jade products. Because jade is thin, internal impurities can be removed without heating, only strong acid is needed. The pickling time depends on the thickness and amount of impurities. The surface gloss of jadeite without glue is better than that of jadeite with glue, but the texture of jadeite becomes more brittle.

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