What is the patina of old porcelain?

Half a year ago, a high-tech crystal abrasive cotton material was introduced into the domestic old-fashioned industry. It is a new professional old-fashioned material with high simulation degree to promote the rapid formation of cow hair lines on porcelain glaze. -----------crystal ground cotton flows into China market, and the consequences of its application completely replace the inferior technique of traditional old cowhide rubbing glaze with sand grains in the past century. Old cowhide and fine sand wipe the glazed surface, and the old cow hair lines are neat and orderly, and it is easy to distinguish the hardness of some fine sand, and it is difficult to cut the glazed surface, which is time-consuming and hard to wipe. It will take a few months to complete a work. It is high-tech-hundreds of fine scratches appear when the crystal abrasive cotton material contacts the glaze. If you beat the glaze of porcelain with the crystal abrasive cotton, the cow hair lines drawn are chaotic. In addition, it's hard for a master who plays with sweat and oil stains to soak up the thief's light, and the glaze is quickly moist, shiny and soft. It is even more difficult to cut if the master uses it to make the old one. Hope that the vast number of Tibetan friends carefully collect.