Alpha and Alpha Light Cutlery are hard anodized. This finish will be damaged by the caustic cleanser used in dishwashers. The cutlery will have a rough, matte appearance if damage of this kind occurs; damaged utensils should not be used.
Titanium Cutlery has a blue anodized finish. If this finish is removed by the cleanser of a dishwasher, the cutlery (which will now be grey) is still safe to use.