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Depending on the acid, oil is no protection, ie cell rotting scales will still corrode a blade but in everyday use carbon steel benefits from being oiled.

Good question.

People learn in combinations of different ways. I am dominantly a visual kinda guy but the thumb test tells me a lot .
Visual, Auditory, and Kinesthetic Learning Styles (VAK)

It doesn't have to be high mag. As I said I hone using an 8x loupe but the magnification shows the answer to "Why is my razor not shaving so well now ?"

What is normal Jimmy ? You mean no magnification at all ? These are a couple just using the iPhone. You can see a couple of pits in the edge but the toe damage is not obvious at all.
There was...

I got this razor in for edge repair which was stored for 4 months.

The rust & pitting didn't make sense as I know the owner doesn't wet his razor during the shave , just wipes dry.
I also know he...