The cookware has been processed by an electrolytic process through a series of baths, so that the aluminum molecules in the surface layer change their structure permanently, creating an “anodic oxide” film on it.
The surface won’t rust, blister or peel, and is easy to clean. However, they should be hand washed, as harsh dishwashing powder for dish washers can affect the surface .
The surface is also a non-reactive one, so unlike regular aluminum cookware, it is fine for acidic foods such as tomato, wine, lemon juice, rhubarb, etc. It also won’t react with asparagus, artichoke, egg yolk, etc.
A modified process called Silver Anodising results in a surface that is a silver colour.
A well-known brand of Anodised Aluminium cookware is Calphalon.