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In the real world, with handful of standout exceptions, pure metals tend to be greyish to silvery white. It's the compounds and alloys that are colorful.

 

For example, when people make 'Blue Steel', they're usually using electrical current or heat to very carefully oxidize the outermost layer of a steel alloy object.

 

Copper is one of those standouts. Rather than grey or white, it has that characteristic orangey-red color in its pure state. Then, when it reacts with any other chemicals, it turns that bright Statue-of-Liberty-bluish-green shade. 

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