Just spending a little time doing some testing on the 1/4" acrylic that I finally was able to break into usable size for the Glowforge. In the photo, ignore that deep score across the top on the back sides of the test pieces, that was just one of my unsuccessful scoring attempts, not the laser.
Anyway, besides the fact that engraving on acrylic is really awesome, I thought folks might be interested in a different material for color infill. What I’m using is different colors of patinas by Vintaj. They came from my local Hobby Lobby when they were having one of their periodic 50% off sales. They are intended to work on metal but seem to work pretty well on acrylic as well. I’m thinking the advantage over acrylic paint might be a lower likelihood of peeling off, but YMMV.