Yes. I have made a lot of beads like that and I've found that the transparent blues and aquamarines are more prone to thermal cracking. The darker the color the worse it is. I never use cobalt on these beads any more, it always cracks. The other colors are ok as long as I put the beads directly into the kiln, as opposed to batch annealing.
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Alex Mironov
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BHB/PANDORA EXCHANGE IN THE PATIO
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Does some glass crack easier than others?
