What do you do with 90+ different colors of spray paint and a bunch of ceramic tiles… you get sidetracked from another project. Since acquiring my GF I have developed a debilitating disorder… ADHLLS, Attention Deficit Hey Let’s Laser That!
Taking a mental break from the painted canvases, I decided to play around a little more with the Norton tile method. Following are some sample tests that hopefully will be useful or mildly interesting to someone.
All tiles received two coats and were allowed to dry thoroughly before engraving. If I can find my macro lens I will get some closeups later, but each product produced a visual result. If you have any questions, please ask.
The lettering here was colored with a Sharpie. In the closeup, next below, you can see the glaze was still melted however there was no pigment to create a contrast.
!
I only cleaned half of this one to show the difference between before and after cleaning.
I had to try the Moly Lube too.
Edit-
As noted by @tjones, in my laser focus zeal to get these tile test posted, I transposed the power and speed settings. 
:My apologies if you thought about contacting CS looking for you turbo power button.
any other frit would likely work also as the chemicals would be bound into the glass and rarely as high as 100ppm.