when you add color most or all the Metallic character of the aluminum lost because pigments cover the underlying surface. but if you get just a clear coat no pigment Metallic characters of the aluminum are retained. or Organic Dying you actually all Metallic character of the aluminum retained adds a high brilliance. so it is possible to keep the same brilliance of an object that is anodized
im no were near this smart i got all my information off
www.anodizing.org great site with anything you would want to know about the process actually some what interesting.