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Making Oobleck & What to Do with It

by Jean Van't Hul
February 27, 2022
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Making Oobleck is quick to whip up with just two ingredients. Then see our list of favorite ways to play with this amazing sensory material!

Updated March 2022

Oobleck is a completely mesmerizing material for kids to touch and play with. Since it’s just cornstarch and water (plus any color you want to add), it’s super easy and inexpensive to make. It’s also taste safe and non toxic, making it a great sensory play material for babies and toddlers.

Sometimes it acts like a solid. Sometimes it acts like a liquid.

sensory table with goop
Photo by Rachel Withers

And, to add to the weirdness, oobleck acts differently from a normal liquid and differently from a normal solid.

How is that possible?

making oobleck and playing with it
Photo by Andrea Martelle

Oobleck is a non-Newtonian fluid, meaning it is a pressure-dependent substance.

If you increase the pressure on the oobleck, it increases the viscosity or thickness. But if you poke at it quickly, it feels like a solid. And if you hold some in your hand, it will ooze out of your fingers like a liquid.

(Just for reference, other non-Newtonian fluids include quicksand and Silly Putty).

Since our first batch of sensory goop, we’ve made oobleck many other times.

Sometimes with toddler art groups, sometimes on our own, sometimes at birthday parties. We’ve done it inside and outside, in small batches or large, often playing with it using hands, tools, and even feet.

making oobleck
Photo by Andrea Martelle
This post contains affiliate links.

Making Oobleck

For our oobleck recipe see how to make oobleck (it is super easy!) as well as some of the fun things to do with it.

If you like, start by reading Bartholomew and the Oobleck by Dr. Seuss, the book that inspired this goop’s fun name.

Now, for what to do with this fun, non-Newtonian fluid…

Child playing with oobleck.
Photo by Rachel Withers

13 Super Fun Things to Do With Oobleck

  1. Drive toy cars through it (it’s just cornstarch, remember, and washes off easily)
  2. Play with it using your hands (of course!)
  3. Let the goop drip through a strainer, a berry basket, or something else with holes
  4. Make dancing oobleck (on Babble Dabble Do)
  5. Try color mixing with it! Either add the food coloring to white oobleck or mix two colors of the stuff together
  6. Dribble and paint with goop on a sidewalk or driveway
  7. Use it for pretend play (on Simply Learning)
  8. Make your goop glow in the dark (on Babble Dabble Do)
  9. Make oobleck slime (on Play to Learn Preschool)
  10. Try freezing it (on Inspiration Laboratories)
  11. Send oobleck down a marble run (on Sugar Aunts)
  12. Make sudsy goop (on Fun Littles)
  13. Have a Rainbow Ooblek Play Group Party (on Meri Cherry)

P.S. If you have a corn sensitivity in your family, you can make this with arrowroot powder instead.

children playing with oobleck
Photo by Rachel Withers

More Sensory Activities for Kids

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photo by Andrea Martelle
Making Oobleck & What to Do with It

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