Colours in Metal are all categorized as any of a class of elementary substances, as gold, silver, or copper, all of which are crystalline when solid and many of which are characterized by opacity, ductility, conductivity, and a unique luster when freshly fractured. defined by Dictionary.com

The colours of Metal is amazing as the colours are naturally created by exposing to air and moisture.
This colour palettes can be found in COLOURlovers. The photo used in this post is from Kavewall for references purpose only.