@Trebest You do know that the 1981 is an all Copper Planchet and the 1995 is a Copper plated zinc planchet? Just Environmental Damage stains on your Cents... No Mint Errors of any kind
Crazy but cool n yes I know the copper difference that's why i was asking why the coloring green/yellow shine is like the 95s
The coloring is due to whatever copper reacting materials/gasses that the coin has come in contact with. Your guess is as good as mine, but it's not due to the minting process