Slumping issue

#12579
dlanuti
Participant

About 50% of my slump firings have resulted with a large dome shape in the bottom of the glass.

It’s a large bubble shape where it should be flat. I just fired 2 glass pieces in identical molds at the same time, one was perfect and flat in the middle, the other had a large dome in the center. The holes are clear, so that’s not it. HELP!!

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