Copper is a red colored metal which is regularly chosen for its antique look. Moreover, due to oxidation its color becomes darker over time giving it an even more authentic appearance.
The antique character makes copper a particular suitable alloy for medieval coins in board games or role playing games.
Copper is also chosen as base metal for gold and silver plated coins.
Copper is also chosen for its specific electromagnetic signature and material density allowing electronic coin validators to distinguish them easily from other coins.
