Create your own high-jumping bouncy balls using a simple chemical reaction! Kids will learn about polymers and how molecules link together to create a stretchy, bouncy material.

Tools

• mixing bowl
• stirring spoon
• measuring spoons

Materials

• white school glue (PVA glue, 1/4 cup)
• borax powder (1 tsp)
• warm water (3/4 cup)
• cornstarch (1 tbsp)
• food coloring (2-3 drops)

Safety

• Adult supervision is required.
• Do not eat the materials; borax is not edible.
• Wash hands thoroughly after handling the mixture.
• Avoid contact with eyes.
• Protect work surface. Materials may stain clothing.
• Adult supervision required for children under 8.

Steps

1. Fill the mixing bowl with 3/4 cup of warm water and stir in 1 teaspoon of borax powder until it is completely dissolved.
2. In a separate small container, pour 1/4 cup of white school glue.
3. Add 1 tablespoon of cornstarch to the glue and stir until smooth.
4. Add 2-3 drops of your favorite food coloring to the glue mixture and stir until the color is even.
5. Pour the glue mixture into the borax water solution.
6. Use the spoon to stir the mixture gently. You will notice the glue starting to clump together and separate from the water.
7. Once the ball has formed a solid mass, lift it out of the water with the spoon.
8. Rinse the ball under cool water to remove any excess borax solution.
9. Roll the ball between your palms and fingers for 2-3 minutes to shape it into a perfect sphere and make it firmer.
10. Drop your new bouncy ball on a hard surface to test its bounce!