On the "mesh number" problem often mentioned in teapots ~

The "mesh number" often mentioned in teapot usually refers to the thickness of mud. Generally speaking, anything under 60 mesh is considered coarse, and vice versa. The bigger the mesh, the finer the mud. On the contrary, if the mesh number is low, the particles will be coarse, the porosity will be large, the sound of hitting by hand will be hoarse and stuffy, and the mud will have a strong sense of granularity. Purple sand in Ming Dynasty contains granular coarse sand. The mesh number of purple clay in Ming Dynasty was 25-30 mesh, and in the middle of Qing Dynasty it was 55-60 mesh. The mechanized means used in the development of modern science and technology are mostly 100- 120 mesh.