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Crazing
One of the most common glaze defects is crazing, although in some cases crazing is a sought after effect. Crazing will occur when the glaze doesn't fit the clay body. The glaze shrinks more than the clay during the cooling, thus causing the effect. Crazing can occur after a piece has been fired. Often one will hear a bowl or platter making a so-called pinging noise long after firing. Crazing can also occur over centuries, as can be seen in many older wares, that would have looked okay initially.
Remedies:
· Add silica to the clay body
· Add silica to the glaze
· Add alumina to the glaze
· Soak the kiln
Guru Spotlight |
Byron White |