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Glen, I think what he's doing is using a lot of Maas creating an oxidized paste on the blade and his cloth. Then he's not wiping off that paste completely and he's getting concerned that the paste...

Sounds like a fun razor to work on. When you say "tarnish" do you mean the darker gray or black stains, aka "patina" or "oxidation" rather than rust?

Weird that the Maas would seem to "move it...