Bronze Age...

An alloy of copper and tin...

A Copper-Zinc alloy, on the other hand, is also called Brass or Gunmetal.

Fallen Oak leaves (Quercus velutina/the Black Oak) is a species of Oak in the red Oak group.

 

Abgefallene Blätter einer Färber-Eiche (Quercus velutina)

 

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