Glowing Chalk

We went over to the Duffin's house last night for pizza and s'mores out on their deck and Todd had bought some glow in the dark chalk from Target for the kids to play with. It was very cool and bizarre stuff. It's actually a kit where you make the chalk from powder and water and let it dry for 25 minutes or so...It was very cool! The kids had a blast coloring in the dark.