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If I am not mistaken red iron oxides have been used on razors for many years.
Check out some of the abrasive pastes offered at www.classicshaving.com .
They have also used the black pastes,...

It looks like your pitting is to deep and extensive to remove without using sandpaper. And thats a lot of work! Use this razor to practice honing on and shaving with. Make you next purchase one with...