BJ Clark | Stinking Desert Ceramics on wed 29 mar 06
Will (or other Orton people),
Could you please give us the official word on what salting orton cones does
to their accuracy?
I posted about this years ago, long before you were monitoring the list, an=
d
had a mixed answer but most people say the cones are stable even after bein=
g
salted.
I'm sure you guys have done extensive testing on this, what were the
results?
Thanks,
--
BJ Clark
Stinking Desert Ceramics
bjclark@stinkingdesert.com
www.stinkingdesert.com
Ivor and Olive Lewis on fri 31 mar 06
Dear BJ Clark ,
It is some years since I did any salt glazing but as I recall the effect =
of salt on Cones was inconsequential.
You put cones in your kiln to indicate that your clay has matured fully =
before injecting salt into your kiln. This has to be done otherwise you =
will have a porous ceramic body. Remember, Salt Glazes have high =
Coefficient of Thermal Expansion and are prone to wholesale crazing. =
Crazing and immaturity lead to seepage.
A second point is that molten salt can "Wick" into an immature body. =
Some time later the unchanged salt will effloresce onto the surface via =
the crazing fissures. Atmospheric moisture can make this happen.
Have fun with your kiln.
Best regards,
Ivor Lewis.
Redhill,
South Australia.
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