Because of the love of the oriental people, the jade is also known as the "Oriental Gems". Because the natural gemstones are bright, the texture is moist and the appearance is beautiful, as the high-quality jade jade has been cherished since ancient times, the natural high-grade jade is very rare. The value is also very expensive. In order to increase its value, the artificial treatment method is often used to improve the color and transparency of jade, because the natural jade has little difference in appearance, so be vigilant when purchasing.
Emerald color and transparency are the hallmarks of its quality. Natural jadeite sometimes contains metal ions such as iron and manganese, which make the jadeite species mixed with black, brown, gray and other colors to affect their vividness. If the background color appears black, brown, gray, etc., the value is significantly reduced. In order to remove these dirty colors, it is usually removed by chemical bleaching, so that the emerald color is bright and the texture is pure and transparent. This is the B goods. The A and B goods of the same appearance have different values, so pay special attention to B goods when buying jade to prevent economic losses.
So, how to identify jade B goods? First of all, we must understand the production process of B goods. Early B goods are easy to use, soak the motley and stain on the jade with acid, and then apply a layer of wax on it. It looks like no difference with natural jade, but it will fall off after a long time or with hot wax. The crack will be revealed. Recently, the B-goods system has become more and more sophisticated, and the naked eye can hardly find flaws, which brings considerable difficulty to the appraisal. The new method of B goods production is: first, in the selection of materials, we must choose a variety of native green but base yellow, gray, brown and other colors, and require that the structure is not too dense, the jade pieces should not be too large, with strong acid (such as Soaking with hydrochloric acid, dilute sulfuric acid, etc., usually for 2 to 3 weeks. Observe that the yellow, gray, brown and other variegated samples of the jadeite are basically taken off. The color of the jade after decolorization is bright, the green color is prominent, and the background color is obviously white, but this jadeite The appearance of a dry crack due to acid corrosion. At this time, soak it in a weak acid salt solution for 1 to 2 days, neutralize the acid solution, and wash it with water. The cleaned jade is dried in a drying oven, and the drying temperature does not exceed 200 °C. Although the overall structure has not changed, the fine structure has been severely damaged, and a loose wire mesh and a hollow structure have appeared, which reduces the strength of the jadeite. In order to restore its strength, it needs to be filled with a strong adhesive epoxy resin. . The filling method is as follows: first, the sample is heated to below 200 ° C, and then immersed in an epoxy resin, and then taken out and dried to uniformly infiltrate the resin into the jade crack and solidify. Finally, the cured jade is polished in the original shape to remove the surface glue visible to the naked eye.
Understand the production process of B goods, which is conducive to the identification. Usually identify the B goods jade from the following aspects:
First, transparency. B goods jade is mostly translucent to slightly transparent, but the transparency is reduced in the water, and it feels like a wax. The concentrating light is seen through the point, the surface is covered with a white cover, the internal structure is not clear, and the natural jade is seen through, and the internal loofah-like mesh structure can be seen.
Second, the gloss. B goods are dull, no natural jade bright and watery, like plastic products.
Third, the feel. B goods jade with repeated touches by hand, there is a glassy temperament, no natural jade slippery.
Fourth, the sound. The two pieces of large size are touched, and the B goods emit a hoarse sound with cracked porcelain.
Five, magnifying glass observation. Under the 10x magnifying glass, the surface of the B cargo is covered with tiny cracks in the shape of a spider web. If the polishing is not in place, the epoxy residue (milky waxy wax) is still visible on the surface.
At present, there are many types of B-carved jade in the market, which are similar to natural jade, and it is difficult to accurately identify them. Fortunately, the B-car jade is difficult to change the process of injecting the filling after bleaching. As long as you understand its production process and then master certain identification methods, you can quickly identify the B-car jade.
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