Dark metal marking

Hi there, can anyone recommend a spray for laser marking metals? I need a pretty dark mark for aluminum.

CerMark but it’s pretty pricey, I would recommend the spray because I’ve bought the liquid in the bottles and it solidifies pretty quickly if you don’t use it for a while.

Cermark is defiantly the main one at 69 for 12 oz or you can make your own.
Here is a link to a recipe and proof of concept photos.

CerMark alternative? - Problems and Support - Glowforge Owners Forum

Will it make black Mark’s on bare aluminum?

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Cermark comes in different formulations LMM6018.LF is aluminum and and anodized aluminum
as far as the home recipe I would say make some and try it out. But both are black.