Engraved the Boston Dynamics (of Big Dog Robot fame) logo on the back of the phone of my friend who works there. The engraving looked stunning, and it turned out bright white.
Settings:
Speed: 150mm/s
Power: 30%
At normal speed of 150mm/s.
First real test engraving of text on anodized aluminum parts.
Speed: 150mm/s
Power: 20%

QR Code, this one not only brings you to the site, but also enters a guest username and password to allow easier login on a mobile phone.
The first test subjects for engraving were glass and anodized aluminum. Since I don't have an exhaust system connected yet, these two materials create virtually no smoke.
Below is a rastered image on black anodized aluminum created from an already low resolution color image. The large square is 20mm wide. The horizontal lines are caused by the rough surface of the extrusion.