Anodizing is a conversion of the aluminum surface to practically pure aluminum oxide: the anodic coating (a true ceramic). Type II is of particular interest to the designer wishing to extol both the virtues of form and function. Allowing for radiant colors; full coverage; full coverage. This anodic coating is significantly more abrasion and corrosion resistant then the untreated metal. This coating may be subsequently dyed in a variety of colors, imparting a very decorative finish both in a satin and a polished surface result. Limitations to these virtues vary according to the alloy and fab method. The casting alloys being the most difficult to work with.