Ochre in the market mainly has black, taupe, cyan, red, yellow and other colors. Black ochre and taupe ochre are widely distributed, while red ochre, yellow ochre and blue ochre are only produced in Surabaya, Shandong Province. Red ochre in Sishui, Shandong Province includes yellow and red yellow.

The original stone skin of Bian Shi Sibin Bian Shi is grayish yellow, but it will turn black after polishing. After long-term absorption of human body oil, Sibin Bian Shi is more black and shiny, so many people remember that Bian Shi is a beautiful black stone. However, black is not the only true color of kerbstone. The composition of bian stone affects the color of bian stone. The main component of natural bian stone is microcrystalline limestone, which contains many trace elements and rare earth elements. At the same time, some stone contains copper, iron and other metal substances, which makes the stone color not only gray-black, but also red, yellow and green.

Sibin Bian stone is not only black, but also the uneven distribution of pyrite makes Bian stone grayish yellow, or local Bian stone has grayish yellow spots. There are many colors of bian stone, but it is impossible to judge whether bian stone is true or not by color alone. The color of rocks is caused by chromogenic elements in rocks, and the diversity of colors may mean that the content of some elements exceeds the standard, which is harmful to human body. Only qualified bian stone is beneficial and harmless to human body.

Extended data:

Whipping, as a long-lost traditional medical skill, has many health care functions, but the existing Bian Shi products are mixed, which seriously limits the popularity of whipping. X-ray diffraction results show that more than 92% of black and tan ochre is microcrystalline calcite, and the dense structure is the direct cause of thermoluminescence and high heat of ochre. Raman spectrum and transmission electron microscope results show that.

There are micron-scale and nano-scale graphite particles in black and yellow-brown ochre, and graphite plays an important role in improving the conductivity and thermal radiation of ochre. Principal component analysis and secondary component analysis show that the content of pyrite in yellow-brown ochre is higher than that in black ochre. The results of transmission electron microscope show that pyrite in black ochre mainly exists in micron form, and the shape of pyrite has great influence on the color and pyroelectricity of ochre.

Baidu Encyclopedia-Bian Shi