Old topic, but a good one.
I tried Cermark on shot glasses today and didn’t have good luck. Basically, I found that if the power put down was high enough to fuse the Cermark and make a nice dark mark, it was also high enough to fracture the glass which meant that the mark would flake off with scrubbing.
If anyone has figured out a way around that, I would love to know.
Samples–
From behind:
Front:
