I have had a box of tiles sitting under my desk for about two years! I have done things with them using Alcohol Inks and decided to play with one today using Marvy DecoColor Opaque Paint Markers.
The Marvy DecoColor markers were black, gold, and silver. The yellow and two blues were Marvy Brush Markers.
I am letting the tile sit on my desk now and dry for at least 24 hours. Then I will spray with a fixative. I want to test to see if anything will happen to the colors/lettering when I put a hot or cold drink on the tile. If nothing happens, yay!
The markers were a bit unwieldy and slippery on the tile, so I did not have as much control over my lines as I'd like to have. I can make better stars, and my lines are a bit wiggly! But I guess practice on this kind of surface with these kinds of utensils is part of the process to make things better.