copper
銅 — Measuring
A cheap metal, easy to work. Used for small change.
The crocodile bronze of Nîmes1st century BC
Copper coin of Kanishka I (Moon God Mao)127–147 AD
Bronze coin of rebuilt CorinthReign of Marcus Aurelius (2nd century)
⚠ When the value of copper itself rises, it becomes more profitable to melt down copper coins and sell them as bullion. This is usually the reason why small denomination coins disappear.