Engraving .063 (14 Ga.) Aluminium Blanks - Beyond the Manual

I’m having trouble finding the correct settings to use to engrave some metal blanks I have. They should be fine to work with, but it’s like the laser doesn’t know it is there. I can put any other material in its place (it appears) and it will engrave it fine. I tried full power, 70%, 30% and different speeds. So far, no luck. Any advice would be welcome!

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