SFrater on sun 21 sep 97
My wife has had an accident with some fresh, dry, unused potters' plaster.
It was spilt over some fully dried greenware. We have removed most of
the plaster dust with brushes and blowing it off. Water not used!
However, does anyone know whether:
(1) we might get away with firing firstly to cone 06 and then secondly to
cone 9; and
(2) any action or precaution needed.
The firings will both be oxidised/neutral in an electric kiln.
Thanks in advance
Simon Frater
Ric Swenson on tue 23 sep 97
Not to worry...fire away!
I read nothing there that will cause you problems. After bisqued, you
could "wash" the pottery off and let dry before glazing....as a
precaution. The dust will cause more problem than the fact that is is
plaster dust....I believe.
You could even lightly sand the pieces with abrasive cloth and then wash
off the dust from the bisquit fired wares, before applying glaze.
"Chunks" of plaster within the body of ceramic piece will usually cause
"lime-popping" .....ie.... AFTER the piece comes out of the glaze
kiln....(sometimes much later.......days....weeks....months??)..... the
chunk will absorb enough moisture and will expand and POP-OUT of the side
of the pot....there will be a little white plaster dot in the bottom of the
spall.
It does NOT sound like you will have that problem at all.
HTH....
Ric
At 11:47 PM -0400 9/21/97, SFrater wrote:
>----------------------------Original message----------------------------
>My wife has had an accident with some fresh, dry, unused potters' plaster.
> It was spilt over some fully dried greenware. We have removed most of
>the plaster dust with brushes and blowing it off. Water not used!
>
>However, does anyone know whether:
>
>(1) we might get away with firing firstly to cone 06 and then secondly to
>cone 9; and
>(2) any action or precaution needed.
>
>The firings will both be oxidised/neutral in an electric kiln.
>
>Thanks in advance
>
>Simon Frater
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
rswenson@bennington.edu "Standard Disclaimers Apply" "Opinions are my
own." Ric Swenson, Bennington College, Route 67 - A, Bennington, Vermont
05201-6001 (802) 442 - 5401 vox 4621 fax 4582 ........ or direct
fax 802 442 - 6164
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***
Kris Baum on wed 24 sep 97
Simon -
I've had some of my tiles get slightly contaminated on the
surface with plaster (from making them in plaster molds) and have
never had a problem. I bisque to ^04 and fire to ^6. I'd give it a
try.
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Kris Baum, Shubunkin Pottery
mailto:shubunki@erols.com
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