It definitely sounds like it got too hot. Did you invest in a computerized kiln, or did you have someone else fire it that has one of those?
A full size computerized kiln is another item on my long wish list, but now I wonder how reliable they are. My old pyrometric cone style one has never let me down and is still going strong after 16 years. Its size is a restriction though (18") which is why I want to go bigger.
Thanks much for the lighting tips - I'll give that a try.
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