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Oh my! that's some pretty rough and tough stuff for a razor. I've never attempted anything as tough as that without diamonds, and never in a razor.

Was the S30V in a razor?

I'm not sure what the difference is in the abrasive and the binder in those stones, but blue steel shouldn't be a problem for either one.

I can't remember what their marketing commentary was, and...

Are they gray only in the japanese market? What about the higher grit ranges, is there a difference between one stone vs. another?

A friend of mine got the glasstones before there was anything but...