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How to "Charcoal Blue" Gun Metal?

Does anybody know how to charcoal blue gun metal? The equipment needed, and temperatures required to produce this finish. This is one area of gun metal restoration that there is not a lot of info on. Thanks much.

Paul Lippold
- Oshkosh, WI, U.S.A.
2002

Robert Jiantonio
Gunsmith & Engraver - Venice, Fl. USA
2007

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