cmyk colors for stock aluminum colors..

[nashvillesigns]

hello!
does anybody know, or, have the "cmyk or pantone" values for certain stock aluminum coated colors?
i am specifically looking for the "heron blue" color equivalent.
alliance metals is the supplier.
thanks ahead!

-Mosher

 

[J Hill Designs]

no matter what, your RIP will probably interpret it differently - match it to a printed color chart off of your printer