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That's why you need two Swaty's; so you can remove the scratches ;-p

I think the concern is that scratches that are large enough to see indicate peaks and valleys that are larger than normal and which might catch the blade and cause micro chipping. Or at least that...

I get rid of lapping scratches left my my DMTC by rubbing the stone I've just lapped with another lapped stone that is hard, fine, and non-porous. I have used my C12K, Swaty's, and a Spyderco pocket...