There are two reasons for cracking: first, the billet extends in a certain direction during molding, which affects the arrangement of molecules; secondly, the billet and glaze have different expansion coefficients, and the shrinkage rate of the glaze layer is large when cooled after roasting. Therefore, cracking is a disadvantage in porcelain firing; however, the opening glaze (ie, crack glaze) that has been mastered by the law of cracking has become a special decoration for porcelain. The Song Dynasty, the official, the Ge Kiln are oil products. The opening film is also called ice crack. According to the color, there are blood stasis, gold wire and light yellow fish, and according to the shape, there are mesh lines, plum patterns, fine lines and so on.
One hundred pieces of shards are one kind of ice cracks, that is, the crack glaze has a dense grain and the opening is relatively fine. The name began in the Song dynasty of the Song Dynasty, and the Jingdezhen kiln was used as a kiln.
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