Hard anodized aluminum cookware has become increasingly popular as aluminum is a cheap material but has health concerns. Hard anodized cookware undergoes a process that creates a durable non-stick coating on the inner surface, protecting foods from direct contact with the aluminum below. This coating reduces leaching of aluminum into foods. While more expensive than regular aluminum, hard anodized cookware is thicker and more durable than enamel coatings. Special care is needed when using these pans to prevent scratching the protective coating.