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That Rust and Blue Remover IS muriatic acid. It does a good job, but do several appllications rather than leaving it on too long as it will frost the steel.
Incidentally, for those who think factories apply a "mirror finish" polish, using blue remover is an education in how much roughness hot salt bluing can cover up. And why gunsmiths who try for a "mirror finish" are never able to duplicate the factory finish.
Jim
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