Indoors · Science & STEM

Oobleck

Mix cornflour and water into a goo that's runny when you hold it but hard when you punch it.

  • Ages 2–9best for 3–7
  • 30–60 minabout 5 mins of prep
  • Prep on the dayplan below
  • Under $20about $3
  • At home (inside)on a rainy day
  • Some helphigh mess

Plan it

Good planning makes a good day. Tick things off as you go.

1On the day

0 of 1 done ·

You'll need

From home

  • Cornflour
  • water
  • a big tray or bowl
  • food colouring (optional)
🪄 Wizard's tip

Let it dry before you clean up: dry oobleck turns back to powder and brushes away.

How to do it

  1. Pour about 2 cups of cornflour into a tray.
  2. Slowly add about 1 cup of water, stirring with hands.
  3. Aim for runny when you tilt it but firm when you tap it.
  4. Squeeze, punch, drip and play.

Younger kids: Add food colouring and small toys to hide and find.

Older kids: Test it: punch, roll a ball, let it drip, and explain why it acts like a solid and a liquid.

⚠ Safety Not for eating. Don't pour it down the sink; it can block drains. Put it in the bin.

Builds Curiosity & science thinkingFine motor skillsCommunication

Clean-up 10 minutes once it dries.

Make it a bigger day Pair with the lava lamp for a kitchen science morning.

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Oobleck