To add to Eileen's great explanation...
The cooling bubbles are erroneously sometimes called "annealing bubbles." I like them better than vermiculite, but the cost is higher and they need to be ordered online.
Also, I keep my bubbles in an old crock pot set to high, to help improve chances of the beads surviving until they can be annealed.
For any of these temporary methods, be sure to keep a new hot bead away from others that are already cooling. If they touch and there's too much difference in temp, the cooler one will crack.
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Roberta
”If it makes you happy, then it’s a good thing.” ~ Terryd
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