sdandrea1 they do have what they call aluminum black by Birchwood Casey. I have never really been able to get it to work. It made the aluminum black, it just never seemed to last very well.
You can anodize aluminum at home. It does require some pool acid, dye, electric current, and boiling water. You could make that piece almost any color you want. Want to change the color? Sand it lightly, and re do it.