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November 2006 Issue
#44
Published by
Gary R. Ferguson – Raku Artist
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In This Issue
* While the Smoke Clears
* Smokeless Alcohol Raku
* Pac-Man Fever
* Shelf Eating Glaze Again
* Inherited Clay
* Flame On
* Raku Links
* Workshops
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Fired Up with Raku is the recently released book by Irene
Poulton is now available. Check out the details at:
http://www.garyrferguson.com/firedupwithraku.htm
I will only be making this available for a few more days.
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* Shelf Eating Glaze Again
In the last issue I included an opinion about glaze left on
a shelf for repeated firings and I had a couple responses:
one who wrote an article for Pottery Making Illustrated and
one who read that article.
Bill wrote:
Glaze drips left on an insulating fire brick or a hard fire
brick or a cordierite/mullite/silicon carbide kiln shelf
will, if sufficient in size, re-melt during each firing and
WILL corrode/eat through the surface. It certainly may take
longer to eat through the harder surfaces, but it will
happen! Cordierite kiln shelves have a 15-20%
porosity/absorption rate, so glaze will migrate through the
shelf. That's why one should use kiln wash, I suggest a
50/50 mix of alumina & kaolin, and chip/grind all glaze
drips off before re-firing. The only shelves I know where
this probably won't happen are nitride bonded silicon
carbide shelves. We use these at 610 with no kiln wash! But
due to issues with thermal shock, I would advise against
using these in Raku
firings.
So, I guess the safe answer is always remove the glaze
drips from your shelves between firings and protect them
with a good coating of kiln wash.
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After reading Sue's book I discovered dozens of tips,
techniques, and methods of creating Raku beads and jewelry
that I never would have thought of. The hundreds of color
photos are not only instructional but inspiring as well.
There is a new idea to try on almost every page. This book
is a gold mine!" http://www.rakubeadjewelry.com
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