Do you know about B and C grade jadeite? Do you still dare to carry it around after watching this?

Due to the preciousness and scarcity of jade resources, there is room for jade counterfeiting to flourish. On the market, the counterfeiting techniques from raw materials to finished products are endless and varied, making it difficult to guard against.

There are many types and methods of jade counterfeiting, so I will not go into details here. Today, I will mainly talk to you about B and C grade jade.

1. What are B-grade, C-grade, and B+C-grade jadeite?

Grade A: natural jadeite that has not been artificially treated

Grade B: "Jade" that is artificially injected with glue, also called bathed or filled with jade.

C-grade jade: artificially colored jade

B+C goods: jadeite that has been injected with glue and colored

The emergence of B-goods was originally a way to utilize waste, but some people have used it in a wrong way, and it has now evolved into a bad behavior of making and selling B-goods for personal gain and deceiving consumers.

2. Three steps to produce B goods and B+C goods

1. Slice the blank:

2. Acid and alkali soaking: also called bathing.

Place the blank in a container and soak it in strong acid for 15-30 days; then, neutralize it with strong alkali and soak it for one month. Strong acids and alkalis dissolve secondary mineral impurities. It also causes severe dissolution of jadeite minerals.

As a result, the raw material becomes very loose, its structure is completely destroyed, and it completely loses its jade texture, becoming no different from soil or stone. Ba San jade is loose in nature, so the acid and alkali washing time can be very short.

3. Glue injection

The blank after acid and alkali washing is placed in a specific container, and epoxy resin glue and corresponding curing agent are added under a vacuum environment. The glue then penetrates into the entire blank under negative pressure, solidifying it into a gum-like B sheet. If color is added to the glue, it becomes a B+C film. The products processed by it are B goods and B+C goods.

The term "filling the beam" is very vivid. As the blank has no backbone after acid and alkali corrosion, glue must be injected to fill the backbone in order to firmly hold the blank together and prevent it from falling apart. Think about it, can this thing still be considered jade? But the seriousness of the problem does not end there. B-goods are also toxic. This needs more attention.

3. Toxicity of B-goods

The toxicity of B-grade jadeite comes from the curing agent, because it contains amines and benzene. Amines are organic bases that are soluble in water and fat. They can also dissolve and penetrate into the fat in the skin, causing dermatitis. Long-term irritation can easily lead to generalized severe dermatitis, allergic reactions and other toxic symptoms.

The toxicity carried by B-grade jade can cause damage to the liver and kidneys, and has a high degree of systemic toxicity; acid-hepatic curing agents can easily cause dermatitis and are irritating to the skin and mucous membranes; aromatic amines and heterocyclic amine curing agents can cause damage to internal organs; diphenyl aromatic amines are carcinogenic.

4. How to identify B-goods

We usually use the method of "one look, two touch, three listen" to identify B-grade jadeite in the market.

At first glance: B-grade jade has a waxy luster due to the colloid it contains, and looks dull. The color of the jade is dull and lacks vitality, and it is not as bright as A-grade jade (which has a glassy luster).

B-grade jadeite also has similarities. For example, in a batch of B-grade jadeite, almost every piece of jadeite looks similar, with no obvious differences. However, A-grade jadeite is never the same; every piece is unique.

Second, touch: When we touch B-grade jade with our hands, it will feel rough, while A-grade jade is smooth and not rough. When weighed in the hand, B-grade jadeite is lighter and does not feel heavy; A-grade jadeite is heavier and has a distinct feeling of heaviness.

Third listen: The sound of B-grade jadeite is very dull, like plastic. The sound of A-grade jade is very crisp, with a metallic resonance. This is very effective for identifying bracelets. Just hang two bracelets, tap them gently, and listen to the sound. You can then clearly distinguish A and B grade jadeite.

In addition, due to the characteristic of B-grade jade that it will emit blue-green fluorescence, it can be identified by using a small ultraviolet fluorescent lamp (some stores will have this equipped). Any jade that emits strong fluorescence is a B-grade jade.

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