Want to grow your own crystals?
Egg shells, Glue, Allum or Salt, Food Color
1. Paint inside egg shells with glue, sprinkle with Allum or Salt, let dry 2 hours
2. Dissolve box of Allum or 1/3 cup Salt into 1 1/2 cups of water
3. Pour solution into two cups
4. Add food coloring
5. Sink shells and wait 2 days
6. Remove shells and see crysatls!
Note: Allum gets big crystals, Salt gets fine crystals.