Spray it. According to the relevant published information, this defect can be avoided by using the spraying medium with low shrinkage, and at the same time, the thicker the pigment is, the thinner the pigment is when spraying. Ceramics is the floorboard of pottery and porcelain, and it is also a kind of arts and crafts in China. As early as the Neolithic Age, there were painted pottery and black pottery with rough and simple styles. The texture and properties of ceramics are different. Pottery is mainly made of clay with high viscosity and strong plasticity, which is opaque, with fine pores, weak water absorption and turbid tapping sound.