Jade has always been loved by people. Relevant experts remind people that buying jade must be cautious, and bad selection will also affect health. Wang Chunsheng, a senior engineer of the National Jewelry Quality Supervision and Inspection Center, believes that jade is generally divided into three kinds of goods: A, B, and C. A goods refers to jade of original stone color, which is a jade that is not chemically treated, and the price is relatively high. B goods are chemically bleached and refilled with resin, which is cheaper. C goods are poor in color. When heated to 110 degrees Celsius, they are soaked in a chromium salt solution for one or two days, so that the chromium salt penetrates into the crack of the jade material to achieve the dyeing effect. At the beginning, it will be crystal clear and will fade after one or two years. This jade is cheap and good, but it has no collection value. Nowadays, the B+C goods are more common in the market, and they are processed by the simultaneous combination of B goods and C goods.
.jpg)
Wang Chunsheng said that A cargo is natural jade, its constituent elements are relatively fixed, generally harmless to the human body; the resin in B cargo does not encounter external force, generally does not have much harm; B+C or C cargo dyes its acid The solution may be harmful to the skin after fading, because some merchants may use strong acid such as hydrofluoric acid, nitric acid, sulfuric acid, hydrochloric acid to imitate the old color of jade, and then apply a layer of floor paint on the surface of fake jade. , crystal paint or epoxy resin.
Hao Fengtong, director of the Occupational Diseases and Toxicology Department of Beijing Chaoyang Hospital, believes that resinous substances and strong acid together may cause irritation. After contact with human body, they may develop contact dermatitis, which may cause redness, tingling, itching and peeling. People with more sensitive skin are most likely to have symptoms.
Both experts recommend that for health and safety, it is best to wear natural jade that is not chemically treated.
Cotton Dyed Crepe,Cotton Voile Crepe,Cotton Stripe Fabric,Cotton Card Fabric
Shaoxing RongMai Trading Co., Ltd , https://www.rm-fabric.com