Production and Identification Methods of B+C Grade Jadeite

The acid washing, dyeing and filling treatment of jade is often referred to as B+C treatment. There are many types of dyed colors, the most common of which is green.

1. Production method

The B+C treatment method is better and more efficient than simple dyeing. The process feature is that after the jade is washed with acid and alkali, it is washed and dried, and then the loose jade is colored. It can be soaked in dye solution or painted with a brush. It can be colored in the required places, or it can be painted into color bands on the bracelet. It can be painted with a variety of different colors, and color can be added to the light green jade to make it more obvious. After being dyed and dried, the rough jade is then filled with glue, which not only improves its transparency and mechanical strength, but also seals the color in the resin glue, making the pigment less likely to fade, thus extending the service life of the B+C jade. Therefore, B+C jade has many color varieties and distribution forms, and is more similar to natural jade.

2. Identification characteristics of B+C dyed green jadeite

Generally speaking, B+C jade is easy to identify. Green B+C jade has the characteristics of C jade in addition to the characteristics of B jade. The most typical identification characteristics are:

1.Filamentous green

Green dye can only attach to the surface of the mineral particles that make up jade. The thickness of the green dye is very thin. In the direction vertical to the thin layer of green dye, the green color is most obvious and appears in the form of thin lines. Sometimes the green dye seeps into the cleavage joints of the jadeite grains, forming parallel green filaments. These features can be clearly observed using transmitted light. Natural green jade veins are composed of many green jadeite particles, so the green color veins usually have a certain width, can pass through many particles, and have a certain length.

2. Loofah pulp structure

After jade is washed with acid, larger gaps are formed between the mineral particles. The dye is absorbed and precipitated on the surface of these mineral particles, forming a three-dimensional network structure. This feature can be clearly seen under side light. The structural features caused by this color do not exist in natural green jadeite.

3. Blurred ribbon boundaries

B+C dyed green jadeite is often dyed into an uneven shape to imitate the appearance of natural green jadeite, but the boundaries of the green color bands (color spots) of B+C dyed green jadeite are relatively fuzzy, without clear edges, which is different from the green color bands of natural green jadeite.

4. Other features
In addition to the above-mentioned characteristics related to dyeing, B+C dyed green jadeite also has all the characteristics of B-grade jadeite.

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