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Maybe, I melted one once, a 2X3 when I sprayed it with Oven cleaner. Literally it just melted, I rinsed it off as quick as I could in a tub of water, then it just fell apart.

I have a couple of...

Looks like a Coticule with Blue Slate backer, the backer not intended for honing, so don’t waste time lapping. Most Thuringia stones are generally much thicker, coticule blue slate backers were thin,...