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bisqueware turning white

updated sun 9 nov 97

 

Sarah Barnes on wed 5 nov 97

Hi! I just fired a bisque kiln ^06 in a gas updraft kiln. Some of the
stoneware pieces turned white. They seem to absorb water like any other
bisqueware, I didn't over fire as far as I can tell, so I am at a loss as
to why this happened. Has this happened to anyone else and do you know why?
Thanks for helping
Sarah
In Baltimore
sbarnes@mica.edu

Craig Martell on wed 5 nov 97

At 10:32 AM 11/5/97 EST, Sarah Barnes wrote:
>----------------------------Original message----------------------------
>Hi! I just fired a bisque kiln ^06 in a gas updraft kiln. Some of the
>stoneware pieces turned white.

Hello Sarah:

Are you firing more than one claybody? It's not unusual for stoneware clays
with a low iron content to fire white or off-white in the bisque. With more
iron in the clays, one would expect to see a pinker cast to the bisque ware.

regards, Craig Martell-Oregon...firing a coupla bisques myself today!!

Ron Roy on sat 8 nov 97

Hi Sarah,

Sometimes bisque will come out different colours because some is reduced
while the rest is oxidized. I certainly remember seeing that when I was
learning to fire my kiln. The more iron in the clay the more obvious the
difference.



>----------------------------Original message----------------------------
>Hi! I just fired a bisque kiln ^06 in a gas updraft kiln. Some of the
>stoneware pieces turned white. They seem to absorb water like any other
>bisqueware, I didn't over fire as far as I can tell, so I am at a loss as
>to why this happened. Has this happened to anyone else and do you know why?
>Thanks for helping
>Sarah
>In Baltimore
>sbarnes@mica.edu

Ron Roy
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