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And you don't have a piece of clean steel? So that you can breadknife it and then hone it with some good steel left?

Indeed I think it's more cosmetic and not deep into the steel.
Let us know your progression with the razor ;)

Call me weird, but I personally think that the razor will still take a great edge. Best way to know is to try honing it.
Decoloration doesn't necessarily mean that it's corrosion or pitting.
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