Dave Murphy on tue 7 nov 00
Hi all:
I have experienced this same effect as John and Ivor talked about in =
previous posts, that is, a crackling sound across the pot when you tried =
to feel the surface. It has only been with the pesky rutile blues that =
this has happened. It can be really a pain because the pieces often =
look overfired but a cone pack right beside a particular pot says not! =
Any ideas out there, eh Tom Buck?
Barbara Murphy
Waterloo County Pottery
Waterloo, Ontario
Canada
Cindy Strnad on tue 7 nov 00
Hi, Barbara.
I'm not as knowledgeable as Tom B by a long, long, long shot, but I will
offer a quick idea regarding your question. I suggest your glaze and/or clay
isn't really suitable for the temp you're firing to. If it looks over-fired,
back it off a half a cone or so and see if that helps. If it's a glaze
that's worked well before at that temp, then your materials have probably
changed and you'll be in for some experimenting in order to get it to work
again.
Cindy Strnad
Earthen Vessels Pottery
RR 1, Box 51
Custer, SD 57730
USA
earthenv@gwtc.net
http://www.earthenvesselssd.com
michael wendt on tue 7 nov 00
My shop vac hose becomes so charged when I vacuum that I sometimes get
shocked. Could the kiln gases flowing over the pots be acting like a Van de
Graf generator and building up a charge that some of the glazes hold better
than others or is the effect also felt in electric kilns? Responses?
Guessing,
Michael Wendt
-----Original Message-----
From: Dave Murphy
To: CLAYART@LSV.CERAMICS.ORG
Date: Tuesday, November 07, 2000 7:43 AM
Subject: electrically charged glaze
Hi all:
I have experienced this same effect as John and Ivor talked about in
previous posts, that is, a crackling sound across the pot when you tried to
feel the surface. It has only been with the pesky rutile blues that this
has happened. It can be really a pain because the pieces often look
overfired but a cone pack right beside a particular pot says not! Any ideas
out there, eh Tom Buck?
Barbara Murphy
Waterloo County Pottery
Waterloo, Ontario
Canada
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Snail Scott on wed 8 nov 00
Michael-
My tame physicist says "yep". Any violent environment will
create electrical charge, and the cause you suggested is
undoubtedly part of it. He guesses that the effect would
be less in an electric kiln, but would still occur.
-Snail
At 03:02 AM 11/7/00 -0800, you wrote:
>My shop vac hose becomes so charged when I vacuum that I sometimes get
>shocked. Could the kiln gases flowing over the pots be acting like a Van de
>Graf generator and building up a charge that some of the glazes hold better
>than others or is the effect also felt in electric kilns? Responses?
>Guessing,
>Michael Wendt
>-----Original Message-----
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