Latest scrap yard find.

[rmatchell]

Went to the scrap yard today to pick up some brass and found these in the barrel. Anybody know the best way to clean them up, dont think the tumbler will help this time.

These are 40mm bofors one is 1943 the other is 1945.


121288

[SciFiJim]

Maybe a citric acid bath to start and then some brasso or neverdull.

[MtGun44]

Lemishine solution overnight will take off most of the really dark brown tarnish,
then go to work with brass polish, it will leave a pinkish sheen due to the zinc
that has been leached out of the surface alloy. The dark brown is mostly copper
oxide, and the zinc has been partially removed from that surface layer, so when
the citric acid (harmless, like lemonade) reverses the oxidation you will have
a copper-rich (or zinc depleted, depending on the point of view) layer which
will be pinkish.

Bill