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Old 2021-09-28, 8:46am
LarryC LarryC is offline
Senior Member
Join Date: Mar 07, 2011
Location: Northern California
Posts: 2,023

Lets start calling this what it is. Its a failure in annealing. Of course if you dont box the piece with even heat throughout, it is much harder to reduce the stress overall. Lots of factrs can lead to this mode. This is why in the furnace glassblowing world we take great pains to flash the whole finished piece to equalize the heat before boxing.
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