Oil Based Sharpies?
 

Has anyone used oil based Sharpies on tile coasters? Do they last? I used regular Sharpies on an inked tile coaster last spring and by fall, it was faded. I'd like to make more coasters, but want the coloring to last.

I have no idea personally, but here are some articles that discuss using Sharpie oil-based paint markers on ceramic surfaces - hth:
sharpie oil based paint marker on ceramic - Bing