Glaze characteristics of the blue and white porcelain of the Yuan Dynasty:
The use of the binary formula of the Yuanqinghua fetal soil increases the firing temperature, which can change the formulation of the glaze accordingly.
Jingdezhen porcelain glaze has always been formulated with glaze and glaze. The glaze is a kind of porcelain stone with a lighter weathering. The main component is limestone. After calcination, calcium oxide (CaO) is about 90%.
Tang Songjin, the main component of Jingdezhen porcelain is glaze ash. In the Yuan Dynasty, the glaze composition was added to reduce the glaze composition. Thus, the glaze layer increased in alumina and the calcium oxide decreased, which changed the glaze state. The thickness of the glaze layer can be increased, and the gloss of the glaze is soft. The glaze layer of some specimens was observed with a high magnification magnifying glass, and large bubbles were scattered in the dense misty small bubbles, and no medium bubble transition was observed. This is not the case with the blue glaze and the glazed glaze of the same period.
At the beginning of the Ming Dynasty, the blue-and-white porcelain glaze also saw bubbles, but the large, medium, and small bubbles were mixed, and the distribution of the two types of bubbles was different. Some utensils have orange peel or brown eyes on the surface.
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