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Yea, the best explanation for that I've heard, assuming it's good steel, is that it's a "rotted" edge probably due to rusting in the past (maybe it was nun2sharp that did the writeup on that?). Just...

Haha, yes, much easier said than done. Probably a combination of my unit and more likely the operator...

Dang... those are great pics!

I have one of those microscopes. I can't get anything near that good of an image looking through it with my eye. And my 60x (lowest power) looks more magnified than...