Oh look, a squirrel!
You know, come to think of it, way back when I had a hothead and was cooling in a fiber blanket to batch anneal......I did some larger beads that had cracks like that along the side. It turns out they were hitting each other in the blanket, or too close and the hotter one would crack the cooler one, or vice versa. Also I might not have been heating evenly before I put them in.
So it may indeed be temperature related, as Kathy said it needs to be heated evenly. Was anything else in the kiln?
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Kristin ~
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