This method will remove the black/red. I gave it a shot on a war nickle I had and it cleaned up pretty nice. After cleaning it left the nickle a kinda of a slate/dull color. Just don't leave them in the solution to long. I would say just long enough to get cleaned up. ":what ever amount of time that is" Just keep an eye on them. Don't clean any coins that you might want to sale!
I was out with a buddy near a VERY old house and found a V nickle 1 inch down next to a big tree.. I cant make out none of the marking except the V with the wreaths... I have to clean it to try and see a date.. I hope its from the 1800s as this will be my first.. The coin is BADLY tarnished and I just put it in the sauce and Now I am hoping for the best.. I am new to the game for the most part and wondering if the whole electrolysis is bad for the coins too?