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From my knife experience, I have found that if you are going for the "hand rubbed" look, the alternate direction sanding kinda becomes superfluous once you get at and above 600 grit or so. At that...

That is the OTHER kind of rust, the "good" type of iron oxide that you are trying to get when you blue a gun using the old school rust or fume bluing method or when you get a patina on a carbon steel...