Hi Rebecca,

Thanks for contacting us.

Oxidation on aluminum handles is most often caused by the abrasive detergents, high temperatures used in a dishwasher, as well as if left in wet conditions. When oxidation occurs, aluminum may appear dull with a gray or black residue. This is merely a characteristic of aluminum and in no way affects the durability of the handle or the performance of the knife.

If your knives have suffered from oxidation, you can use a cleanser such as Bar Keepers Friend. Using this product as directed will help return knives to their pre-oxidized condition.

Hand washing all fine cutlery is recommended to protect your knives from corrosion and extend the life of their finish.

If you have further questions, please let us know.