What is the cause of kiln glaze

1. Kiln glaze, as the name implies, is an unexpected glaze effect during the firing process. As the kiln contains a variety of coloring elements, by oxidation or reduction, porcelain may show unexpected glaze effect after the kiln. Because the appearance of the kiln change glaze is accidental and special, and people do not know its principle. They only know the changes in the roasting process in the kiln, so it is called "kiln change glaze". As the saying goes, "kiln change is unique", it means that the kiln change glaze is unpredictable and unique.

2, firing porcelain, where the kiln is not found after the expected shape or glaze color,  the heirloom porcelain sometimes occur in a special situation, can be said  "kiln change". The Tares History Compilation says: "porcelain with a quality, then into a different quality, with a color, then into a different color, water and soil together, not the human skill can add, is called kiln change." In a word, kiln transformation can be divided into deformation, discoloration and metamorphism.