Every S.T.E.A.M. student NEEDS to know how to make oobleck.

Every S.T.E.A.M. student NEEDS to know how to make oobleck.

What’s liquid when you hold it in the palm of your hand, but turns into a solid if you ball it up in your fist? If you guessed Oobleck — you’re right! Let’s learn how to make this rapidly changing mixture in the comfort of your kitchen.

Like slime and crunchy slime, Oobleck is also a non-Newtonian fluid, which means it contains most of the properties most other liquids and solids do. When you squeeze Oobleck, it feels rock-solid, but try picking it up and it runs through your fingers. You can take your Oobleck over-the-top by adding Styrofoam balls to make it feel like a solid block. Go forth, future STEM professional, and get to experimenting!


What You’ll Need:

  • 1 part water (add as much, or as little as you’d like, as long as you’re consistent with the cornstarch)
  • 2 parts cornstarch
  • food coloring of your choice
  • Styrofoam balls for some added crunch


  • Start by adding your two parts of cornstarch into your favorite mixing bowl.
  • Add in some water, just a little bit at a time, stirring it in to the cornstarch until the consistency reaches maximum awesomeness.
  • Add in the food coloring of your choice.
  • Stir the food coloring into the cornstarch and water mixture. Things might get messy. (use a spoon if you’re more of a neat freak).
  • Now you have Ooblek!
  • Add in the foam balls for some extra texture. Optional, but recommended. Like wearing deodorant.
  • Now grab a handful of your Oobleck, and watch in wonder as it goes from a solid to a liquid!


  • Store in an air-tight container when you’re finished, and make sure to mix occasionally to keep the water and cornstarch concoction combined.
  • If you put in food coloring and mixed it in with your hands, don’t worry, it’ll wash away with a good scrub in a day or two!
  • To dispose of your Oobleck, mix in a lot of hot water to make it loose and watered-down. Pour a small amount into the drain while the hot water is running to ensure that it goes down easy.
  • Oobleck, when it’s dried, is easy to be vacuumed. But be careful, when it’s wet, it’s not easy to remove from couches, decks, or wherever you’re showing off your new gooey goodness.
  • Oobleck is made mostly with edible ingredients, but whatever you do, don’t give it a taste. It’s gross, and Styrofoam balls aren’t meant to be eaten. Ever. No matter what.