Ron Roy on tue 4 apr 00
As a pot cools - and the glaze becomes too small for the pot - the crazing
becomes greater - in other words the crackes become wider. After initial
primary grazing (big spaces between the cracks) secondary crazing happens
as the tension works on the glaze - most times this happens even though the
pot is no longer being cooled because of the residual tension in the glaze.
The point here is - if you want to trap stain in craze lines cool the pot
more - like maybe freeze it - the cracks will be more open - easier to get
the stain in - then, when the the pot returns to room temp the stain will
be held in better because the cracks will close up a bit - AND - further
crazing will not happen because the tension is relieved on the glaze that
is not crazed.
It really depends at what stage you want to show the crazing - if you want
the lines further apart the best way to do it is to adjust the fit of the
glaze. Get the crazing to happen during the freezing - then it will be
possible to stop further crazing - if the clay is vitrious enough to
prevent rehydration of the clay.
RR
Ron Roy
93 Pegasus Trail
Scarborough
Ontario, Canada
M1G 3N8
Evenings 416-439-2621
Fax 416-438-7849
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