Today's jade market is full of fakes, which often makes consumers daunting. Dyeing is one of the common ways of fraud. Some bad merchants sell dyed low-grade jade as jade to consumers for profiteering. There are two types of artificial dyeing: It is dyed green or violet blue on white jade, and the other is green on the emerald with natural pale green to make it more beautiful. In the domestic name is Jade C, the color of the jade C is fake, generally B plus c even the transparency head is also fake, usually after the jade is pickled, glued and dyed, the common dyed jade has Green, purple, yellow, etc.
The method of artificial color change can be divided into three types. One is dyeing with organic dyes and the second is coating, hot baking or electroplating. The third is the bombardment of high-energy particles.
The first two methods have some common features. The green color floats on the surface, often yellowish or bluish, so it is called "evil color." Examination with a magnifying glass precipitated the dye in the fine hairline cracks between the adjacent particles of the jadeite. For the identification of light green jade and a little artificial color, it is necessary to pay great attention. If you do not carefully observe it, it is extremely difficult to identify. According to the coloring jade that is bombarded with high-energy particles, according to Comrade Mofu, it is characterized by a uniform green color and a certain depth. After cutting the radiation-induced jade, the green around the epidermis is ring-shaped and plaque-like, and the epidermis has relics that are “bombardedâ€, often deeper than those that are not “snappedâ€.
Chelsea filters are an important tool for checking dyed jade. This color filter can transmit yellow-green light and deep red light. Green jade has two segments of green and yellow-green spectrum. Under the filter, yellow-green light can pass through, and yellow-green is seen. After the chromate-stained green, a spectrum of the green portion is absorbed by the color filter, while the deep red light segment is transmitted in a large amount. Therefore, the dyed jade shows a deep red color under the color filter. The natural green jade has not been found so far, and it shows red under the color filter. The use of color filters must pay great attention to the intensity of light. It is best under normal daylight. The light-emitting tube that consumes a lot of power must not be used. Otherwise, the dyed jade can't show obvious deep red. When conditions permit, it is best to use transmitted light. In order to obtain accurate data, it is necessary to use a spectroscope, a bright green natural jade, usually with three stepped red lines at 630 nm and around 690 nm. Dyed jade presents a blurry band.
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