In article , Martin H. Eastburn
says...

Now someobody has to explain whey copper is red and gold is, well,
gold-colored.

Reflection and absorption.
Martin

Ah but aluminum reflects and absorbs light too - it does so
evenly across the spectrum. What's so special about, say,
copper, that causes it to reflect more of the red. Something
special is going on there.

Jim


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