I have been experimenting with engraving mirrors (with the 2.8W laser) and am finding I end up etching the glass vs just burning the mirror finish off.
The pattern ends up looking yellow/brownish in color. When I take a chisel and scrap the mirror finish off around it, that area goes clear, and you can feel where the glass actually feels etched.
I am placing the mirror on a wood board when I am running the MPCNC.
Thoughts on what I might need to do?
Running Laser Etch Software
Speed (I varied from 1000 - 1600 mm/s with no difference)
Laser power 255