Crystals and Geodes


Enjoy the perfect blend of art + science by growing your own sparking, colorful crystals overnight!

  • 1.

    Open a Silly Putty egg and place the Silly Putty inside in an airtight container.

  • 2.

    Apply Crayola School Glue to the entire Silly Putty egg with a paintbrush.

  • 3.

    Coat the glued Silly Putty egg in alum and allow to dry completely.

  • 4.

    In a bowl, dissolve 3/4 cup of alum in 2 cups of hot water. Stir until it is completely dissolved, add more hot water until alum is dissolved.

  • 5.

    Once the alum is dissolved allow the solution to cool for at least 30 minutes.

  • 6.

    In a separate bowl, dissolve a watercolor cake in a small amount of water.

  • 7.

    Add the watercolor mixture to the dissolves alum solution.

  • 8.

    Submerge the dried, alum coated, Silly Putty egg in the solution and set aside in a safe place overnight. This will allow the crystals to grow!

  • 9.

    The next day, remove the crystal from the solution. If you want to create larger crystals, return it to the solution for another day or two.

  • 10.

    Dry the crystal and display!