"Sibin pumice, original color is dark and yellow", this is the description in ancient books of the color of "Sibin pumice", the raw material of Sibin meteorite. The "Xuan" referred to here is interpreted as "black" (Xinhua Dictionary Page 542). "The surface of Sibin pumice stone is grayish-yellow, but after being polished and polished, it turns black. After absorbing human body oil for a long time, it will become black and shiny. It is a beautiful black stone." Because many consumers do not understand the word "Xuan", merchants interpret the word as red or brown to sell their own three-no products. Therefore, simply relying on the color of the meteorite to identify and buy it is exactly the hype intention of some traders.