I noticed last night that the Thermoclad skillet I was comped several years ago for evaluation has finally become a spinner on my glass radiant cooktop. I can't find the email trail on this, but the pan must have been in light use for 5 years.
I have no idea whether this was a slow or sudden change. But I do know that the pan wasn't subjected to any of the thermal shocks that are the usual culprits for warpage.
I'll try to de-convex with a mallet and see if she'll go back to flat.
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