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I have seen some use a hot vinger bath to darken the patina then sand the blade and others just paint the etching with a very fine brush with most of the hairs removed after all is done

I'm with Cangooner soak, light clean up & use as is
but if you want to restore it get in touch with the lads in the classifieds for sure no Idea on quotes for restos for the pros.

but if you...