Just tried to use Laurel Mt Barrel Brown on a shotgun part, and all I seem to get is copper plating. Is this because the bottle is 10 yrs old, or is it because the humidity is too low. I rigged up a warmer/damp box, and it looks like it's still showing copper after 12 hrs. Anybody have a clue? Ordering a fresh bottle just to be sure. Boiling after rusting always brought out nice rust bluing in the past(see my 45-100 photos), but it was summertime.

hippie redneck geezer