http://www.lunchboxcollections.com/blue-metal/
How is cobalt blue color when the metal is grayish?
Cobalt is a silver metal, and how embedded is blue with it, is it blue when its crushed up or somthing?
When metal complexes with different ligands (something that binds thereto), as organic materials or ions, it changes the energy level spacings of the metal atom. Then absorbs / reflects different colors it would be, as the pure metal. So something grinding gives you just a little powder of the same color, we need a change chemical to change color.
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