The kids had so much fun playing with the glowing rock science we did the other day, that "J" asked could they do it again. So instead of the rocks I made snowballs since we just has our 1st snowfall for the year.
I let the highlighters sit in water over night and then mixed alittle with the snow we made.
Blacklight ($10.00 at Wal-Mart or Home Depot) so worth the money. Lots you can do with it.