DUNTING - Cracking or breaking of pottery during firing.
Dunting is the cracking or breaking of pottery inside the kiln, usually after firing and caused by cooling too rapidly. It is caused either by drafts of cold air, which make one part of the pottery contract quicker than the others or by the ware cooling too quickly, causing hairline cracks or fracturing ware into many pieces. It can be caused by many things, including different thicknesses of clay in the same body. This happens more with thick clay because the outside can be dry but the inside still damp, so when being fired, the gases and heat cannot escape and the force breaks the work.