Should I Clean My Coins? Hearing Different Answers

Generally speaking no do not clean your coins at all. What you are seeing is mostly PATINA or oxidation of the materials in the coin. Silver coins are generally 90% silver and then 10% copper - tin - nickel alloy of some blend. Modern coins have a copper core with a tin jacket. That 1974 Kennedy 50C is not silver however, and looks almost like someone too a punch to the right side of it? Whats it say? Also the date looks punched? Strange coin. But yea dont clean these. Thanks for posting!