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Crafts & Hobbies: Can anyone tell me what causes bubbles in my glaze?

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Forum: Crafts & HobbiesReplies: 38, Views: 168
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Portland, OR

December 31, 2009
10:23 AM

Post #7412589

I am a ceramics newbie and my first glaze left lots of bubbles on some of the pieces.
I fired 25 identical (for the most part) pieces and the pieces varied from zero bubbles to one piece with a dozen or so.
Could it be that I didn't fire the bisque hot enough? Or is the temperature for the glaze all wrong. The bottle said to fire the glaze to cone 06 but all I had was 07 cones. I also fired the bisque to 07 (but I do have 03 cones for that)
Using a kiln sitter so the cones are sitter cones.
I don't have any witness cones.

P.S. This was my very first time with clay and glaze so I'm not too surprised that I am having problems.

Also, is there a more active ceramics forum out there somewhere?


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