occurs when a glaze contracts, in the cooling cycle, more than the
clay body after the form has been fired.
on the other hand, the clay body contracts more than the glaze then
the glaze will not craze. In this case the glaze is said to be "in
compression" and it will have greater strength than if the
glaze has crazed.
sometimes takes years to emerge particularly in the case of low
or mid range firing where the clay body can absorb moisture over
time thus swelling minutely but sufficiently to place stress on
however, a glaze prone to crazing will begin to crack quite soon
after the firing. Crazing can sometimes be heard occurring as a
"pinging" sound in the cooling kiln or soon after the
form has been taken from the kiln.
cooling of a form after it has been fired may encourage crazing
as the glaze will cool more rapidly than the clay body even though
eventually the glaze may be in compression.
is a glaze which has a fine pattern of crazing which suggests
that the glaze is a long way away from fitting the body on
which it was fired.
glaze displays a much coarser pattern of crazing (stained
with ink). This suggests that the glaze is much closer to
fitting on the body. With some adjustments the crazing may