The blue mud of purple sand crab shell means that the color of mud is the blue of crab shell. Crab shell green belongs to a kind of vermicelli. But there are hundreds of innovative mud materials, typical of which are azure and crab shell green.

Generally, it is a harmonious color. Taking ceramics as an example, iron is used as a colorant and fired in a high-temperature reducing atmosphere, for example; The main colors range from bluish white to dark green, and the main varieties of colored glazes can be collectively referred to as, for example, Moon White, Shadow Blue, Longquan, Bean Green, Bean Green, Pink Blue, Azure Blue, Jade Blue and Crab Shell Blue.

Introduction of purple sand mud:

Also known as Zisha Mine, nicknamed "rich soil", commonly known as "azure mud", "reddish brown mud", "bottom groove mud" and "red mud", it is the main raw material for making Zisha pots (vessels). It was buried hundreds of meters under the Huanglong Mountain rock formation, between the "nail mud" cracks. In Yixing, purple sand can only be found in clay mines in Dingshu area.

Finished products made of purple sand, such as purple sand pots, purple sand pots, purple sand vases, purple sand tea sets and other purple sand crafts. Thanks to drinking tea, the teapot is the most common, which is characterized by not taking away the aroma of tea and not having the taste of cooking soup. The wall of the teapot absorbed the fragrance of tea, and the empty teapot was filled with boiling water for a long time.