Found some brass out in the desert. Looked to have been out there for over a year. The brass was all tarnished and black looking. Picked it up and put it in my tumbler. I ran it for hours and that tarnish would never come off. So came up with this bright idea of putting the brass in a zip lock storage bag and put ketchup in the bag till it covered up the brass. Mixed up the ketchup and brass and let it sit for a couple of hours. Rinsed it off and put outside to dry. Placed it back into my tumble and in about an hour this is how it looks. Works great. Anybody else try this?