Diffuse color on Metallic Material does not do anything, ie does not alter any color or restart render if changed.
I don't know if it is supposed to do anything?... (but would be cool if it did )
The reason I ask is because when added as a part of a layered material, the Diffuse Color is not part of the metallic layer, so was thinking maybe it is supposed to be inactive and maybe only operable in a certain specific situation?
Speaking of Metallic-a,
JUST CALL MY NAME 'CAUSE I'LL HERE YOU SCREAM....
OC-TANE!!
OC-TANE!!...
Oc-taaaaane....
Oc-taaaaaaaaaaayne