Sooooo.....after the potato try, I have a new GEMORO ultra sonic cleaner for jewelry, thought I'd give that a try, no difference, well, they are back in the olive oil, I don't know, turns them more black then anything else it's looking like, only been a few days, again, I really don't want to tumble them, although they are common dates for Indian Heads, except the ONE that is semi-key date, any better ideas floating around fella's, I know about lemon juice for some things, but I don't know that it would be copper friendly. I'm just happy that I have found the ones I have, and we can all go out and buy nice looking coins, but that's not what we do. The thrill is in FINDING them out there somewhere.