TrickleCharge ✭✭✭✭

(View Post)

(View Post)

Just looking at the 2016 cent you used as a test piece, it is coming back at almost equal parts copper and zinc. The XRF isn't reliable for showing the true composition of a plated coin. (View Post)

Stack's Coin Resource Center has some good info. https://stacksbowers.com/coin-resource-center/coin/1853-o-no-arrows-no-rays-liberty-seated-half-dollar/ (View Post)

Also appears toned back in 2017. https://www.greatcollections.com/Coin/505685/1942-Mercury-Dime-PCGS-MS-67-FB-CAC-Green (View Post)