Ice crack is the fission caused by the different shrinkage of porcelain and glaze when porcelain comes out of the kiln.
The so-called "kiln change" mainly refers to the uncertain natural change of surface glaze color caused by the temperature change in the kiln during the firing process of porcelain. The ancients defined kiln change relatively broadly, even including the change of porcelain type.
Supplement:
Ice cracking, also known as chipping, is an ancient firing process of ceramics in Han Dynasty. It belongs to a variety of Longquan celadon, and is named for its three-dimensional texture such as crushed ice and overlapping lobes. The production process of ice cracks is extremely complicated, and it was lost after the demise of the Southern Song Dynasty. In June, 2004, 165438+ 10, "Celadon Ice Cracks and the Manufacturing Method of Its Products" won the national invention patent (patent number Zha 02 12052 1.3), and invented Geyao "Ice Cracks", which became Longquan Celadon.