Patrice Murtha on mon 29 apr 02
In our last firing at school we experienced problems with the shino
flaking off in areas--the surface appears very glassy with small
cracks that chip off when you run your fingernail across it. In the
past I have had very good luck with this particular shino recipe and
now all of sudden this happens. Any suggestions as to what might be
occuring?
--
Patrice Murtha
Ryerson and Burnham Libraries
The Art Institute of Chicago
111 S. Michigan Ave.
Chicago, IL 60603
312-443-3671
Tony Ferguson on mon 29 apr 02
Hello,
What percentage of melter do you have in your claybody or is it the same
body you used before? I have had shino flake off when there wasn't enough
feldspar. You want 10-15% feldspar in your body on average. This can also
depend on how long your firing was and how you fired, but more than likely a
clay glaze interface problem. Also, if you are bisquing, what are you
bisquing to? If you tell me your shino recipe I maybe able to make some
recommendations. If you have any pics of the shivering pieces, I would be
curious to see them.
Thank you!
Tony Ferguson
Stoneware, Porcelain, Raku
www.aquariusartgallery.com
workshops available
218-727-6339
315 N. Lake Ave
Apt 312
Duluth, MN 55806
----- Original Message -----
From: "Patrice Murtha"
To:
Sent: Monday, April 29, 2002 12:45 PM
Subject: Shino Flaking
> In our last firing at school we experienced problems with the shino
> flaking off in areas--the surface appears very glassy with small
> cracks that chip off when you run your fingernail across it. In the
> past I have had very good luck with this particular shino recipe and
> now all of sudden this happens. Any suggestions as to what might be
> occuring?
> --
> Patrice Murtha
> Ryerson and Burnham Libraries
> The Art Institute of Chicago
> 111 S. Michigan Ave.
> Chicago, IL 60603
> 312-443-3671
>
>
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Megan Ratchford on mon 29 apr 02
Patrice,
Howdy! I have this problem happen occationally. What is your
percentage of soda ash? Had a consultation with my shivering pieces a
couple weeks ago. The shivering was worse where the carbon trap was best.
I don't have a suggestion as to how to fix this except lowering your soda
ash a bit which I've done and haven't had a problem (fingers crossed) yet.
Megan
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