Can't really feel a difference with the fingernail. I might do the 600-1k-1500 progression on it again, but I might not :D
I have to lap my Chinese 12k, as well.
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I can definitely feel the scratches on this stone when I hone on it. I've been testing it with a razor that isn't exactly sharp yet, just to see if I can feel them. I will try it again on the DMT, followed by a progression on sandpaper on glass to see if I can get it smooth again. It is very hard, but the DMT scratched it up.