Production technology of fire ring cloth

Fire ring cloth is a cloth woven from asbestos fiber, which is named after its incombustibility and decontamination in fire. According to the Travel Notes of Marco Polo, a vein was discovered at the beginning of the mountain. Crush it, it has filaments like wool; Then put it in the sun and dry it; Then, put it in an iron mortar and wash it with water to remove the sediment, leaving only wool-like filaments and weaving it into cloth. The color of this cloth is not too white. Burn the cloth in the fire and take it out as white as snow. Every time the cloth is dirty, it can be as white as ever if it is put in the fire. There are also related records in Shan Hai Jing. Because of its incombustibility, it can remove dirt in fire, so it is often called "fire ring cloth" in China's early history books. Liezi: "Zhou Muwang invited Xi Rong and Xi Rong to present a sword and fire cloth. ..... The cloth of fire will be thrown into the fire, the cloth will be the color of fire, and the soil will be the color of cloth. When it comes out of the fire, it will vibrate and condense into snow. "