Preparation:

1: Make the Borax Solution (Activator)

1. In a small bowl or jug, combine ½ cup warm water and 1 tbsp borax powder.
2. Stir with a spoon until the borax is completely dissolved.
3. Set this activator solution aside. You’ll be using a portion of it in each colour batch.

2: Set Up Your Rainbow Colours

1. Arrange 6 small plastic cups or bowls, one for each rainbow colour (red, orange, yellow, green, blue, purple).
2. In each cup, add:
   • 2 tbsp white glue
   • 1 tbsp cornstarch
   • A few drops of food colouring or gel dye
3. Stir gently with a separate spoon or stick for each colour until smooth and evenly coloured.

3: Add the Borax Solution

1. Add 1 tbsp of borax solution into the first colour mixture.
2. Stir immediately — you’ll see the mixture begin to solidify and thicken into a putty-like texture.
3. Once it clumps together, pick it up and knead it with your hands.
   • It may feel sticky at first, but after 1–2 minutes of kneading, it becomes smooth and bouncy.
4. Repeat this process for each remaining colour.

4: Shape Your Rainbow Bouncy Balls

1. Once each coloured batch is ready, you can:
   • Roll them into individual bouncy balls for a rainbow collection
   • Combine small pieces of each colour to make swirled rainbow bouncy balls
2. Press and roll between your palms until smooth and round.