paul m wilmoth on sat 11 oct 97
Dear John Neely,
With Texas Barbecue in hand, I know for sure that the only thing
that I did differently was the post firing reduction in my typical ^10
firing which resulted in a black core problem in my iron bearing
vitrified clay body.
To put it simply: no post fire reduction = no black core(for that
particular situation)
Point in fact is that the clay can be reduced further (to the point of
black core) after the body has reached vitrification. This black color
of the body happened after the kiln had reached cone 10, cooled for 5
hours then was reduced heavily for 30 minutes at dull red color It did
also make the wares weak and brittle.
Perhaps you wonder if the clay was indeed vitrified at cone 10,
without accurate testing one cannot be 100% positive. I do know that it
was very tight.
FYI-15%om4ball - 25% cedar heights gold art - 25% APGreen fire clay -
5% cedar heights red art - 10% 200mesh silica - 15% potash feldspar
- 5% med grog was the clay body in use at the time.
I am not spouting off theory - I am reporting results
carry on - Paul Wilmoth
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