I hate it when I think I know something and then I find out I don't - MS70 on copper ....
I'm certain I've read on these Boards MS70 can be used as a gentle cleaner without harm to the coin. I also recall there are some who believe at a microscopic level MS70 does alter a coin's surface. I've used MS70 on nickels many times, and have a feel for what it does to the coin.
Today, I had some uncirculated BN Lincoln cents that I was about to throw in the Coin Club door prize pile. Instead, I decided to try MS70 on them, the first time I've done so. The results were astonishing. The coins are BN, but they are pretty. The orange, purple and blue tones make them look like they were doctored. Were they?
If we were all the same, the world would be an incredibly boring place.