I like glow so much that I have endangered my collection ... admiring my marbles in the dark. Those are some nice ones.
I wish I still had at least the photos of my popeye which had at least four different colors under blacklight. (I'm guessing a lot of people never noticed the multi-color glow on that kind of marble -- it was pretty but not strong -- had to take the picture away from usual uranium marbles to get the colors to come out.)