Slime wrote:
> Does copper really have such sharp reflections? Pennies sure don't.
> 
I think most of the time, no, but then we have those examples of early 
Roman copper mirrors and so on.  It can be polished up. Just like brass. 
  We used to do this to the copper plates we used for etching.  We used 
brass cleaner.  It really creates a mirror-like and deeply luminous 
surface.  Slightest oil smudges from your fingers would stand out.  But 
surface dings would look less like pocks and more like gouges where you 
could see the metal displaced.  True pocks would fill in with grunge.

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