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I have more disappoining results from chromium oxide than positive ones. the resulting edge from it almost always seems less keen (sounds a lot like my complaints with a coticule, huh).
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I use the SGS 30K as my last hone whenever I put a fresh edge onto a razor. 9 times out of 10, it is the last abrasive the edge meets before going to linen/canvas and leather. The other 1 out of 10...