How to Make Oobleck

Have you ever made Oobleck? It’s an unusual project but great as it is educational (sciencey) as well as fun to make and good for sensory play ideas. Here’s How to Make Oobleck:

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Oobleck is a non-Newtonian fluid. What does that mean? It means it acts like a liquid when being poured, but acts like a solid when a force is acting on it.

You can grab it and then it will ooze out of your hands.

Oobleck gets its name from the Dr. Seuss book “Bartholomew and the Oobleck” where a green and gooey substance, Oobleck, fell from the sky and wreaked havoc in the kingdom.


  • 1 cup water
  • 1.5-2 cups cornflour (corn starch)
  • Food colouring (optional)

What to Do

1. Put the water in a bowl and start adding the corn starch to it, stirring with a spoon to start with but you’ll need to use your handsn to mix it eventually as it gets thicker and thicker.

2. When you have added the 1.5 cups of cornflour, start adding it more slowly. You want a consistency where the Oobleck is liquid but solid at the same time.

3. If you add too much cornflour just add some more water.

4. When you’re happy with the consistency add a few drops of food colouring and mix with your hands.

5. Now have a good old play with it!

oobleckHere are things to try:

  • Grab a handful, squeeze it and then let it ooze out of your fingers.
  • Drag your fingers through it.
  • Roll some oobleck into a solid ball but when you stop moving it, it will melt back into liquid in your hand.
  • Jab at the Oobleck then slowly let your finger sink in.

You might also enjoy this sandy oobleck in 23 Sand Play Ideas Kids will Love. Also 5 fun Science Experiments for Kids to Try at Home and 50 Fun Rainy Day Activities for Kids

Over to you now! Have you  made Oobleck? What did you think? Tell us in the comments below!

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Jill is one of the co-founders of Mykidstime and a mum of 2 girls