Engraved shotgun receiver (game scenes -medium relief), blue. What's the best way to remove the bluing and protect the resulting exposed metal? I'd be concerned about using a chemical since the top and bottom will need to be taped off to create clean division lines. Thinking chem could leak under the tape and possibly create an uneven break line. Thought maybe Flitz and careful buffing with a Dremel on slow speed might get it done? Something else by hand? What protective coating after? Suggestions appreciated.