Anodized aluminum can be easily laser marked with MOPA lasers. It can produce a variety of gray tones all the way to a rich black. The special thing about it is that the short pulse durations don't damage the surface of the material, or just barely. The anodized layer is not removed, but repainted. Although the process is completely different from the production of annealing colors on stainless steel, the results are comparable.
Especially with natural anodized aluminum, you can create very nice markings. But anodized aluminum in other dark colors can be lasered as black. In combination with conventional engraving (or removal) of the anodized layer, there are many possibilities for marking products made of this material.