In a bowl, mix 1/2 cup of white glue with a few drops of food coloring if desired. Stir well until the color is fully blended.

In a separate container, dissolve 1 tablespoon of borax in 1 cup of warm water. Stir until the borax is completely dissolved.

Add 1/2 cup of cornstarch to the glue mixture and mix until combined. The mixture will begin to thicken.

Slowly pour the borax solution into the glue and cornstarch mixture, stirring continuously. You will notice the mixture forming into a more solid, rubbery substance.

Continue mixing with a spoon or your hands until the mixture forms a ball. Knead it for a few minutes until it becomes less sticky and more elastic.

Once it reaches a firm, bouncy consistency, it is ready to play with.

Store the bouncing ball in an airtight container or plastic bag to prevent it from drying out.