Dunting is a fault that can occur during the firing of ceramic articles.
[2][3] Although usually occurring during, cooling dunts can also be caused by excessively fast heating rates.
[4][5] It has been found that bodies formulated with quartz rather than flint were more susceptible to dunting, especially on re-fire.
It was postulated this may be related to the lower Young's modulus of the quartz based bodies.
[6] Dunting also occurs in wares produced from montmorillonite clay bodies due to the volume expansion of cristobalite during its inversion upon cooling.