There are places where clay is produced all over the world, but there is no purple sand, because this pottery is not a pottery. It can be said that purple sand is a kind of clay, only found in Yixing. Why do you call the clay here "Zisha"? That is because the purple sand made of purple clay, whether it is yellow, red, brown, black or green, has a purple light on its surface. It has a simple and elegant texture, so it is called "purple sand".
The reason why Zisha is called “sand†is because of the finished product of Zisha, which has a special sense of particles. Even if the soil is very fine, under the delicate appearance, you can still see the beautiful three-dimensional sense of particles. The purple sand has a firm texture, a calm color and beautifully crafted. According to the adjustment of the purple sand pottery method and the change of the firing temperature atmosphere, the products are azure, maroon, dark liver, pear skin, beige, cinnabar purple, jellyfish red, green ash, dark green and other colors.
The characteristics of Zisha are clear and quaint, the outside of the product is not glazed, and it is fired in an oxidizing atmosphere of 1100 to 1180 °C to produce a natural and peaceful texture. The colorful colors can change dozens of colors, which can be roughly divided into purple, brown, red, black, yellow and green. After its color is burned, it will not fade. After soaking in the tea, it can show a warm and light texture, and there is a big difference between the opaque color of other clays.
The raw materials of purple sand have been scientifically analyzed, including chemical components such as iron oxide, aluminum oxide, magnesium oxide, potassium oxide, sodium oxide, lead oxide, manganese oxide, etc. The mineral soil composed of minerals belongs to kaolin, quartz, mica type, suitable minerals. The chemical combination and the particle combination make the water absorption rate of the purple sand product less than 2%, and the porosity is between the ordinary pottery porcelain. The pores of the purple sand are divided into closed pores and open pores. Due to this special structure, it has good gas permeability, and the tea is placed in the teapot for several days without being smashed. The finished product of Zisha also has the characteristics of tossing. If it is used for a long time, it will also absorb the dust in the air. If it is used for oiling, the oil will be stored in the soil, which is difficult to remove; the tea will be stored.
When the soil of the teapot is hot (such as when it is drenched in boiling water and the ground soil is warmed up), the pores are opened and the contents stored in the soil are spit out. When the storage is tea, it will spit tea; if it is oil, it will spit oil; if it is stored, it will spit it. Usually this substitution is done simultaneously. Therefore, the teapot is used to make tea, and the effect of making tea is the best, and because of its storage and replacement function, the effect of making tea is getting better and better.
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