Laser engraved
Mirror Glass

First, put in the area you want to engrave a piece of anodized aluminum. Like this you do not engrave the work area too. Alternatively, you can also work with the honeycomb table. Then, you set the mirror with the mirror side facing up into the laser.
After that you can engrave the mirror reflective side up side through the glass with your desired pattern. Glass does not react with the fiber laser, and so only the mirror layer is removed by the laser. The glass itself is not scratched because it reacts only to the wavelength of the CO₂ laser source.

Engraving:

Power: 100 %, speed: 10 %, frequency: 1000 ppi

The cleaning afterwards is very easy because the erosion and dust of the engraving lands on the table under the mirror and not on the mirror itself.

The last step involves the painting. You apply acrylic lacquer to the back of the mirror. The final result: The mirror layer is removed due to the engraving. This part of the mirror is now transparent. So the colors of the paint remain bright and intense because of the transparency of the glass.