The “unglazed polishing” in Jianshui purple pottery is not relative to “glaze polishing”, but to the direct glazed surface, and is specifically for the purple pottery polished to mirror light.
Often met Tao you with bright purple pottery to ask me: “is this glazed?” In their impression, only glazed pottery or porcelain can have that bright texture. Jianshui purple pottery, as a kind of pottery, can also be made without glaze. It is as bright as a mirror and can even reflect people’s shadow. How can it be done?
This is mainly related to the fineness of Jianshui purple pottery. Jianshui purple pottery belongs to high temperature unglazed fine pottery, and “fine” refers to fine clay.
At present, the clay of Jianshui purple pottery is more than 200 mesh, and even 380 mesh higher. Therefore, it is no exaggeration to say that the clay of Jianshui purple pottery is as fine as plaster.
Such fine clay can not only meet the decoration process of wet block engraving and positive filling, but also produce various surface effects during the final grinding, such as common sanding, matte, sub bright, bright and so on.
Because of the different degree of grinding, the texture effect of the surface is different. The lower the grinding degree is, the rougher the surface is; on the contrary, the smoother the surface is until it is as bright as the mirror, so as to achieve the effect of illuminating human shadow.
Therefore, Jianshui purple pottery craft said “glandless polishing”, which means that in the case of no glaze, can also be ground to a very bright effect.