CStanford said:

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Stu, why can you get rid of the imperfections and still keep a flat back? If you're rubbing, steel is being removed and along with it the imperfections you speak of.

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Plane blade. Flat, smooth and freshly flattened, with slight back bevel.



If we can agree that this blade would be generally considered to be in 'good shape' then all is well.

The same plane blade under 200x magnification...



If the scratches and rust pits as visible back from the edge are acceptable to you, then by all means stick with that 'flat back'.

In case you're wondering, the back was polished with a Shapton Pro #12000. The back bevel was not and is approximately 1mm wide.

Stu.

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