Between bright generation Xuan Denian, with Ming Yongle year although a time is close, but color of porcelain embryo glair however widely different. Same containers esp. for use in the house, always happy embryo is thick, announce heart embryo is thin. Xuan Deshi is big carve implement bottom does not have glair more, the place that show a fetus often has gules place, common calls “ flint erythema ” , still have ferruginous spot. The china of copy announce heart when Qing Kangxi, Yong Zheng does not have this feature.

The fetal glair of the china when clear Dai Kangxi, fetal description is detailed white, the embryo is qualitative pure, exquisite and hard, compare with the photograph of same containers esp. for use in the house of each dynasty, its carcass is the heaviest. In addition, of this one period same implement, often apply two kinds of white glair, implement inside, lip, implement outsole applies powdery white glair, its glair is rarer, often see have small shrink glair phenomenon; Bottom comes back in embryo of existing still base grain trace. Implement apply bright green glair personally, its glair jade-like stone embellish is shining, fetal glair is united in wedlock extremely firm close. A household utensils applies two kinds of glair, it is clear Dai Kangxi year the biggest characteristic of a manufacturing china.

Had mastered the main characteristic of embryo of porcelain of each face pottery and porcelain, lubricious glair, it is the reliable basis of the time that we differentiate ancient pottery and porcelain and kiln mouth.