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I forgot to mention a warped blade, color in the edge, if the heel and toe get sharpened, you'll see the middle will not and vice versa.

They require some honing gymnastics / a narrow hone / or...

Uneven wear is a very common thing, a razor isn't ground perfectly symmetrically and inevitably honing will also create a slight unevenness in wear

That said, I use a permanent marker pen and...