At present, in the Guangzhou wholesale market, Hetian jade with a black skin appears, both raw materials and finished products appear. After routine testing, it is completely consistent with the parameters of Hetian jade. Figure 1:
Figure 1 dyed Hetian jade raw materials
Hetian jade, which is stained with epidermis, is more common. It is mainly used to imitate “seed materialâ€, but most of them are yellow or maroon skin. Now the black stained epidermis is still found for the first time.
In the process of detection, it was found that the black-stained epidermis was different from yellow or maroon. The specific test analysis is as follows:
1. The stained area of ​​the epidermis has a certain depth. Unlike the yellow or maroon stained epidermis, most of them exist in the suture or superficial layer. Figure 2:
Figure 2 has a certain depth of black skin
2. In the scale inspection, it is found that the surface structure is seriously damaged, and there is a feeling of “scale†and “lifting layerâ€, which may be caused by strong acid immersion or heat treatment, and the color appears as a mesh-like distribution under transmitted light. Figure 3:
Figure 3 shows the destruction of the epidermis
3, the skin color is not the same as the ordinary dye, the surface of the raw material coated with alcohol, ether or hydrochloric acid does not fade, using the QUANT'X-type fluorescence spectrometer to detect trace metal elements on the surface, found that there are obvious peaks of Ca, Fe and Ag. It can be judged that there is Ag+ in the dye, which is not natural, that is, black is colored by Ag+. Figure 4
Figure 4 energy spectrometer can test the surface of the obvious Ag peak
Hetian jade's skin treatment has been quite common in the industry, but this black treatment method was first discovered, and in terms of dyeing effect, it has a certain depth and is highly deceptive. This is to remind people inside and outside the industry to pay attention to this treatment.
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