In recent years, with the increase of consumers' attention to Bian Shi, many merchants also aim at the Bian Shi market, so Bian Shi products of various colors emerge in an endless stream, and more and more people have doubts about the color of Bian Shi. What color is Bian Shi? In fact, the word "Bian Shi" is a general term for stone medical tools. Because it is a common name, there is no color difference. Among many stone-bian products, stone-bian made of Spence pumice is undoubtedly the best health care product, which is determined by the special physical characteristics of Spence pumice. "Spence pumice" is a kind of flaky stone floating on the surface, and its thickness is not more than 10 cm (so it is not mined or mined). Its natural color is dark yellow (that is, the color of stone skin is dark yellow), and it becomes black and shiny after rubbing with human body for a long time. It is a black beautiful stone (in recent years, a small amount of brown "Spence pumice" raw material has been found, but it is not necessarily a brown stone. However, there are also cases where unscrupulous traders pretend to be "Sibin Pumice" with other stones. Therefore, we should consider the quality and price of "Bian Shi". It is best to buy a reputable brand (mostly a medical device registration certificate issued by the State Administration of Medical Supplies), or ask the merchant for radionuclide limit and far infrared detection report when purchasing. 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.