Spence pumice is yellow in color, black and shiny after long-term friction and oil absorption with human body. It is a beautiful black stone. The reason why the pumice in Sibin is mysterious and yellow can be understood from its composition analysis. Microscopic identification shows that the main mineral component of pumice in Sibin is calcite, and the chemical component is calcium carbonate (CaCO3), accounting for 99% by volume. The rest is a small amount of pyrite and clay, accounting for 1%. Chemical analysis shows that the content of calcium oxide (CaO) in pumice in Sibin is 54.6%, and the loss on ignition (CO2) is 42.4%. Both of them come from calcium carbonate (CaCO3→CaO+CO2↑) in pumice from Sibin. The sum of their weight content is 97%, which is basically consistent with the microscopic observation results. As we all know, the rock made of calcium carbonate is gray, and the adsorbed oil turns black. Why does the pumice in Sibin sometimes turn yellow? It turns out that in addition to calcium carbonate, there is pyrite with a content of nearly 1%. The chemical composition of pyrite is ferrous sulfide (FeS), and the name of traditional Chinese medicine is native copper, which is yellow. If such a small amount of pyrite is evenly distributed in the rock, it will not appear yellow. However, due to the uneven distribution of pyrite in Spence pumice, it is sometimes just enriched on the surface, which makes the kerbstone grayish yellow or has grayish yellow spots on the kerbstone. In addition, among the 62 elements contained in Sibin pumice, none is close to 1%, and its content is at most a few thousandths, which cannot affect the color of Sibin pumice.
The raw material of Sibin stone is Sibin pumice. The skin of the original stone is grayish yellow, but it is black after polishing. It will turn black and shine after long-term absorption of human body oil, and it is a black beautiful stone. Regarding whether the "Blackstone" sold in the market that consumers are concerned about recently is authentic Spine Stone, the reporter learned through many investigations that the so-called Spine Stone is mostly black, but most of the "Blackstone" sold in the market is not real Spine Stone. At present, most of the "black bian stone" sold in the market is called Sibin bian stone, but the price ranges from ten yuan, dozens of yuan to thousands of yuan. However, the "Spinstone" sold by most vendors has not been tested for chemical elements, so it is impossible to issue corresponding test reports. What's more, the concept of "jewelry appraisal certificate" is used to misinterpret "microcrystalline limestone" as Spent stone. Some "black-hearted" vendors use black marble, Lingbi stone and various building stones to impersonate "Sibin stone" to deceive consumers. We know that wearing or using inferior stone with excessive radiation or harmful elements such as lead, mercury and arsenic will cause hair loss, immune system diseases or heavy metal poisoning.
Spence pumice is a good stone, but the stone is not limited to Spence pumice. Heavy objects made of other kinds of rocks have their own specific colors. For example, the furniture made in xiuyan jade is light green, the furniture made of Muyu stone is brown, and the red "bian stone" seen in the market is usually "Fu Guihong" or "Muyu stone". These two kinds of red stones are beautiful in appearance and are suitable for making handicrafts. No matter which natural rock is chosen as the weight, it is necessary to comply with the mandatory safety standards for the limit of radioactive nuclides and harmful substances issued by the AQSIQ. Enterprise standards set stricter safety standards than national standards. But the furniture made by the manufacturer can be used as long as it meets the requirements of the national standard. Although all these stones can be made into stone tools, the effect is not as good as Spine stone because of their different physical characteristics.
Bian Shi products with medical device license. Bian Shi belongs to the category of medical instruments of traditional Chinese medicine. Only the products approved by the Food and Drug Administration are genuine, and only when they act on the human body can they play a role in regulating diseases. Bian Shi Tongrentang. Tongrentang has been selling Spinibao Bian Shi brand for nearly ten years, and has achieved good sales and high reputation. Consumers should recognize the brand when buying. Crystalline particle size. Spin kerbstone has fine surface, high polishing degree and small mineral crystal size, about 0.03 mm Please read the test report of mineral crystal size clearly when buying. Far infrared effect. Wearing or using bian stone can speed up the blood flow of human microcirculation by 20%, which is called activating qi and promoting blood circulation in Chinese medicine, and is interpreted as "far infrared phenomenon" in modern science. Therefore, bian stone with far infrared characteristics is a good bian stone.
Ultrasonic pulse. When Sibin Bian Shi rubs against human body, it will produce 3708 ultrasonic pulses with frequency range of (200-2000)kHz, which is much higher than other materials. This is why Bian Shi Scraping Board is more suitable for scraping. When buying, you should read the ultrasonic parameter test report of the product clearly.
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Matters needing attention
Due to the chaotic market in Bian Shi, there is a phenomenon of shoddy goods in Sibin Bian Shi, so it is not difficult to explain the prevalence of low-priced and inferior Bian Shi. Consumers should carefully distinguish when buying, and don't blindly follow the trend.