Jade identification: Characteristics of B-grade jadeite

What I want to share with you today is the characteristics of B-grade jadeite in jadeite identification. We will explain it to you from the two aspects of color and structure.

Color: B-grade jadeite that has been bleached and injected with glue is generally brightly colored and unnatural. The boundary between the color and the base color is obvious, and the transition is extremely unnatural. Under strong transmitted light, the color of B-grade jadeite becomes lighter and slightly yellowish.

Structure: Due to strong acid corrosion, the structure of B-grade jadeite becomes loose, leaving uneven corrosion pits on the surface. When observing along its polished surface, an uneven structure like orange peel can be seen, which is called the "orange peel effect". After years of jade identification and research, it was found that its structure was loose, the luminescence was weakened, and it was difficult to observe "fly wings" on the surface. When two pieces of B-grade jadeite are hit against each other, a muffled collision sound can be heard, which is different from that of A-grade jadeite. In addition, B-grade jadeite does not feel as cold as A-grade jadeite when placed on the face or on the back of the hand.

Since the structure of B-grade jadeite is destroyed, it mostly has a resin luster (the glass luster of A-grade jadeite). After the waxing treatment, B-grade jadeite mostly has a waxy luster. In addition, it will show white fluorescence under ultraviolet light. It should be noted that B-grade jadeite does not change color under the Charles filter, but the absorption peak of epoxy resin can be seen on the infrared spectrometer.

In addition, the identification of B-grade jadeite can also be done with the help of destructive identification methods, which will cause a certain degree of damage to the jadeite itself. "Fire burning method". Since epoxy resin is an organic substance, using fire to burn B-grade products will turn the epoxy resin into yellow or even burn into black. Grade A jade is resistant to high temperatures and can be heated to 800 degrees Celsius without changing color.

Jade B-grade feature 1: Bright and unnatural color

Jade B-grade feature 2: The boundary between the color and the background color is obvious, and the transition is extremely unnatural

Jade B-grade feature 3: waxy luster

Jadeite B-grade feature 4: White fluorescence under ultraviolet light

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