If your going base/clear with it they can mix it in small amounts.
I mix 1/2 pint at a time, Do a spray out card. ( ie put the base on a card let it flash and clear it) let it dry and see where you are color wise.. You might hit it semi lucky depending on who's paint your using ppg,dupont,sherwin. That will give you a real good baseline as to where the color needs to go ( ie more voilet, more silver ect )... If you have a good mix guy or you mix and tint yourself you should be able to bring it in from there unless its way off. Then I would color eye it. Remember the color match or color eye only gives you the closest formula that it has on record. So that doesn't mean because you color match it its going to be an exact match, it may still have to be tinted to get where you want to be with it.

Good luck with it.