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I've honed a razor where 1/3 of the blade was like that (toe) and it did not shave comfortably until I got to good steel again. It took several return trips to the 320 DMT and some bread-knifing on...

It looks very crumbly (sp?) or brittle, I would run a few passes across the corner of the stone and set a fresh bevel to get to some fresh steel.

I don't think I've ever seen one quite like that