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clayart digest - 20 may 2006 to 21 may 2006 (#2006-136)

updated fri 26 may 06

 

Roxanne Hunnicutt on tue 23 may 06


Does anyone have experience with paper clay and primitive firing situations? I am interested in trying to make porcelain behave and not crack in a firing pit or barrel. Any ideas are very welcome.

Roxanne in OR where it is drizzling rather heavily today...


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Hank Murrow on tue 23 may 06


On May 23, 2006, at 12:43 PM, Roxanne Hunnicutt wrote:

> Does anyone have experience with paper clay and primitive firing
> situations? I am interested in trying to make porcelain behave and not
> crack in a firing pit or barrel. Any ideas are very welcome.
>
> Roxanne in OR where it is drizzling rather heavily today...

Dear Roxanne;

Raining lightly here in Eugene, and if you wish to avoid the cracking
you suffer with your porcelain....... try getting some of the silica
out of it. There is no need in a body fired that low to have lots of
silica in the body. Talc and Wollastonite are better for this. Also, an
addition of fine-grained kyanite would help. You will probably need to
mix your own clays for this special application to find success. or try
one of those 'schoolroom' bodies that are fine-grained and white.

Cheers, Hank
www.murrow.biz/hank

Ivor and Olive Lewis on thu 25 may 06


Dear Roxanne Hunnicutt,=20

There is an interesting overview of the current state of play in the =
World of Paper Clay. Consult Ceramics Technical, Vol 22. May 2006. =
Graham Hay, "A Paper Clay Updated" pp 37-40, including references.

Best regards,

Ivor Lewis.
Redhill,
South Australia.