I bought this hone about 15 years ago from a woodworking store. It was sold to me as a very fine finishing stone. The box has no markings other than “Karasu 10”. I know that Karasu means crow in Japanese and refers to the pattern, not the type of stone as far as I know.

Does anyone know what it might be?

As far as the stone is concerned, it is very hard, and it takes a long time to raise a slurry with Nagura. Some razors seem to respond well to being finished on it, but others less so. Even after all these years, i am still figuring this stone out. Perhaps I need the right tomo nagura for it?

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