"Bone China", also known as "bone China", is a kind of porcelain with bone powder in its embryo. It first appeared in Europe in the18th century and was invented by the British. After China's porcelain-making technology was introduced to the west, the British combined with western civilization and thought, and made some improvements and infiltration on the basis of China's porcelain-making technology. "Bone China" is the latter kind of porcelain, which is made by mixing 40% to 50% of herbivore bone powder (mainly cow bone) with kaolin and clay for porcelain making. Because bone powder can react with impurities in kaolin during firing, it has the function of eliminating impurities, so that the made bone China is light, strong in toughness, pure in fetal quality, less in defects and more moist and amiable in glaze. Calcium oxide is the real function of bone powder in bone China. Similar to this method, there are "shell porcelain" made of porcelain clay mixed with shellfish and coral components in the ocean; Pearl porcelain is made by mixing pearl ingredients with porcelain clay. As early as the Ming Dynasty, it was found that gorgeous porcelain could be fired by mixing gold, silver, pearls and agate into porcelain tires. According to historical records, in the Ming Dynasty, porcelain makers in Baoshan, Yunnan used precious stones to put into porcelain, and the crystal clear and jewel-like "Yongzi" Weiqi melted at high temperature, which attracted the enthusiastic pursuit of literati and poets in previous dynasties. Known as "the first chess in the world." The reason why "pearl china" is precious is that there are a considerable proportion of pearls in the porcelain tire, which shows the appearance that ordinary bone China does not have. Therefore, judging from the composition of porcelain, "pearl china" can be classified as "Baoshao" porcelain.