Day 36 Cornflour Bouncy Balls

I helped out at a lunchtime science club at school today, and it was so fun. We helped the lower years make cornflour bouncy balls. The original recipe called for custard powder, but our science teachers substituted it with cornflour instead, and it worked just as well.

You will need:

Cornflour or custard powder

White PVA glue

Borax (which you can apparently buy at larger branches of Boots Chemist, or try asking at your chemist)


Stirring rod

Tablespoons or spatulas


Beakers or plastic cups

1. Make a borax solution by mixing half a teaspoon of borax with two tablespoons of water

2. Pour one tablespoon of PVA glue into a plastic cup

3. Add 2 teaspoons of cornflour to the PVA glue

4. Add 1 teaspoon of borax solution to the glue and cornflour mixture and stir until it becomes stiff

5. Take the mixture out of the cup and roll into a ball between your hands

6. The mixture should start to stick together and become drier

Too brittle? Too much borax was added

Too dry? Add some more water

Too soft? Add some more borax

Too wet? Add some more cornflour

Here’s my bouncy ball I made today. I’m glad it turned out okay 🙂


It looks like a dumpling ball, don’t you think?

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