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The CrOx > CBN > FeOx is just what I happened to fall into. Slightly more important than the material is the refinement steps, .5 micron > .25 micon > .1 micron. That's about as fine/sharp as it...

With respect to leather and linen, forget making sharp. They aren't abrasive, that is not what they do. Hones and pastes remove metal and make sharp. Linen and leather straighten and smooth edges to...