Aluminum is not going to darken with the laser, the beam just removes the anodizing, but perhaps you could stain it somehow. I personally don’t have any experience trying it but I would experiment on some other anodized item before trying it with your laptop. Maybe try sharpie using alcohol to clean up around it (cool design BTW).
Yes, it works on aluminum, at least the LMM6000 stuff does; I don’t know if there are other Cermark formulas that do not work on aluminum. I use it periodically.
Haha! Now that I recall, I think my date of cake on here has been incorrect from the beginning…by one day. But, in this case…it’s of no consequence. Thank you, tomorrow!