Identification of B-grade Jadeite

Ultraviolet fluorescence reaction: Natural A-grade jadeite usually has no fluorescence reaction under ultraviolet fluorescence. Grade B jadeite has a stronger blue-white fluorescent reaction. The influencing factor is the type of filling resin. In addition, some wax immersion also has weak to moderate blue-white fluorescence reaction. Therefore, the fluorescence reaction also has a reference value of 70% to 80%.

Frictional heat method: Someone once discovered that by rubbing B-grade jadeite to generate heat, it can absorb small pieces of paper. This is the principle of electrostatic attraction caused by frictional heat generated by resin. It is very consistent with scientific principles and can be operated anywhere. The use of this method depends on the weather humidity, the heat of friction, and the size of the paper scraps. (I always feel that it is a bit like what is said in novels that requires the right time, right place and right people.) Rub the jade quickly on the woolen clothes for about 30 seconds, until your hands feel hot. If it can absorb paper scraps, it is a B-grade product. If it cannot, it may not be a A-grade product either. We can only say that there is a probability. In fact, I still think that this method can only be used as an auxiliary means.

Infrared spectroscopy identification: Infrared spectroscopy is currently the most scientific, accurate, sensitive and rapid detection method. It is a powerful tool for detecting whether B-grade jadeite contains epoxy resin. Its appearance saved the sluggish jade market and made people regain confidence in jade. It is mainly used to identify the chemical composition of substances and determine whether the substance contains water through ion vibration. It is most sensitive for detecting organic matter and is often used in textiles, chemical industry, materials science and other fields.

Raman spectroscopy identification: Raman spectroscopy mainly uses a single color light, that is, radium light, to excite the sample. The reflected Raman scattering signal passes through the Raman spectrometer and is then received by the CCD (charge coupled device). Finally, it is processed by a computer to obtain a Raman spectrum. Raman spectrometers are mostly used to identify mineral types, and can also be used to identify B-grade jadeite. The advantages of Raman spectroscopy are that it is not affected by the size, thickness and transparency of the object to be identified, does not damage the object to be identified, does not require the ring to be removed, and is fast and accurate. The disadvantage is that it is easy to produce a strong fluorescence reaction under the laser source, which will affect the detection results. It is easy to misjudge those with insufficient fat filling or when the detection point does not contain resin. So it is best to test at multiple points during testing.

After studying B-grade jadeite for the past two days, I think everyone should have a better idea of ​​it. Some people may ask, can slightly processed jade be considered B-grade jade? In fact, as long as it is filled with resin, it can be considered B-grade jade, because it may age. It's just a matter of time. The price of A-grade jadeite ranges from one or two million to tens of millions. There is really no need to buy B-grade jadeite because, firstly, it has no room for appreciation in value, and secondly, its luster will become worse and worse after being worn for a long time. Therefore, you must open your eyes and look carefully when purchasing, and don't confuse A and B.

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