Coloring Aluminum

[crokett]

I want to attempt to color a design on an aluminum blank I have. I know there's a process but I don't know the name or what to search for. As an example, I have a set of aluminum bodied coffee cups. One has been colored blue, the other was just polished and left silver. What is the name of the process?

 

[PeetyInMich]

Anodizing - Wikipedia, the free encyclopedia sounds to me like what you are after. Specifically the dying part.

 

[Curly]

BradG has a site about anodizing and etching metals. Caswell is a seller of materials et cetera.