Question: Are there other "unsafe" materials besides green-flame chlorine, what about reflective metals?

Here is my experiment with Aluminum marking, using CRC Dry Moly Lube (spray).
Lasered at 100power and 100 speed, 3 passes.

As you can see, the result is faint. And the laser needed the extra passes to get this dark. The metal appears to be very slightly raised where the moly was (the metal wasn’t pitted like the stainless was.).

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