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Make your own Oobleck!

Wintery days are here, and it is the perfect time for some inside science experiments. The all-time favourite of many little people is oobleck. Here we show you how to make your own and tell you how and why it works.

You will need

  • 1 ½ cups of cornflour
  • 1 cup of water
  • Food colouring or paint


  1. Put the cornflour into a bowl
  2. Add the water 
  3. Mix well (this is tough work, and hands work best)
  4. Add the paint or food colouring

Why does Oobleck work?

Oobleck is so much fun because it is a non-Newtonian fluid, which means its viscosity (runniness) depends on how much stress it is under. For example, if you squeeze, hit or roll it, oobleck behaves like a solid. This happens because applying stress in the form of sudden movement pushes the particles together, making it hard for them to slide against each other. However, once you stop moving it, the oobleck acts like a liquid again.

If you are planning a trip to Dunedin this winter, make sure you check out the Tūhura Otago Museum Science Centre. With over 45 hands-on interactives, there is lots of warm, indoor fun. Plus, you can visit the Tropical Forest, where butterflies play and it is summer all year round.


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