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Those would be microchips. They wouldn't actually ruin the blade. Worst case scenario, you'd need to do a touchup on a slower-cutting hone.

Mixed reviews.. Some swear by it to high heaven and say that no other hone gives a finer edge and other say that it's too aggressive on the thin edges, chips'em easily and is a b**** to clean. I'll...

However, some people "in the know" have been using the Spyderco Ultrafine bench hone for finishing.