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Steve, The glass slumped in the group of four was fairly equivalent to the single slumps I had done. All pieces were an even 1/4". All were Bullseye transparents with some Opal powders. While the original single slumps were clear plus 1137 plus opal powder or clear plus clear plus opal powder; ...

Thanks very much for the advice. Charlie, I guess what you're saying makes sense but isn't the "knowing your kiln" testing whether the kiln is heating evenly. Why did the 13 strips slump evenly? And not the 4 molds? Lisa, I certainly understand that the heat was being absorbed differently ...

From all the threads I've read (this board and the archives) I expected that when I put 4 identical 9" bowl Molds into the kiln I could use the same firing schedule I used for a single mold. It didn't work. The bowls (2 1-2" deep) had barely started to slump and were slumping very uneven. ...

Yep - just checked the shelf and there are two very slight dips in the shelf (maybe 1/16' deep) in the two locations I've seen bubbles. The last firing was on Thinfire and it didn't stop the bubbles. But I'll try two blanks using 1/8th" paper and see if that works -- while I'm waiting for a Bul...

Tom, Ross - Thanks. Yeah - I've been in the dumps all day because the last bubble was in a piece that I need to deliver soon and I don't even have enough replacement glass. I'll check the shelf for level -- I'm suspecting Bert is right because at least two of the holes appeared at about the same pla...

If a Bullseye shelf will fix the problem, it's a cheap solution instead of ruining all this glass.

Thanks much.

I’m having problems with big (2 ½â€