This glow-in-the-dark chalk is fun to play with, whether day or night. Although it looks like regular chalk when the sun is shining, it begins to glow as soon as darkness falls. Use it to make a starry scene in your driveway, or try marking trees and rocks to create a trail you can see in the dark.
1. Use the paper towel to apply a thin layer of petroleum jelly to the mold, or spray the mold with cooking spray. Be sure to thoroughly cover the inside of each mold so the chalk doesn’t stick.
2. Pour the glow-in-the-dark paint into the disposable bowl. Add water and stir until blended.
3. Add the plaster of paris and stir. You can also add glitter or color at this time if you choose. If you don’t add color, the chalk will look white in the daylight.
4. Carefully spoon the chalk mixture into the molds. Tap the mold gently on a hard surface to settle the mixture and release any air bubbles.
5. Allow the chalk to set for several hours. When it feels hard, remove from the mold and place the chalk in a sunny spot for several more hours.
6. Use your glow-in-the-dark chalk just as you would use regular sidewalk chalk. Wait for the sun to set, and enjoy the glow from your creations. A UV black light flashlight or lantern will enhance the glow from your chalk and can be purchased at your local hardware store.