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How to Make Oobleck: Science Fun for Kids

By Brenda P in Activities for Kids

indoor activity sensory activity STEM activityThis post contains affiliate links. As an Amazon Associate, I earn from qualifying purchases.

Have you heard of oobleck? Oobleck is a non-Newtonian fluid that has properties of a solid and a liquid at once. The sensory implications for oobleck make it one of the best sensory activities for sensory seekers, and even kids who avoid sensory experiences may get a kick out of this activity!

playing with oobleck this idea now...

Ever wonder why it’s called oobleck? In the Dr. Seuss tale Bartholomew and the Oobleck, a king makes a magical substance that’s sticky, green, and globby, just like cornstarch and water.

Way back there someone called it oobleck and the name stuck! This activity is extremely messy, so be prepared to do it outside or resign yourself to a messy kitchen.

You will probably also need to change your kiddos clothes after play, but the joy that they experience with oobleck is worth the mess!

ingredients for oobleck

What you need to make Oobleck:

You only need a few things to make oobleck!

  • Large tray
  • Green food coloring
  • Cornstarch
  • Water

If you’re new to oobleck, cornstarch and water, when mixed in the right quantity, is known as a non-Newtonian fluid. This simply means it can have properties of both a solid and a liquid. When pressure is applied, the molecules resist making it feel hard. But when you relax your hand, the molecules relax acting like a liquid and dripping away out of your hand.

How to make Oobleck:

Green dye and cornstarch to make oobleck

Making oobleck isn’t hard, but it can be a little tricky to get the ratios right. It’s easy to make it too wet, which prevents it from having non-Newtonian properties.

First, fill the bottom of your tray with cornstarch.

Dye a cup of water green.playing with oobleck

Slowly add your green water to the cornstarch, mixing as you go. Once you have enough that it hardens when you squeeze it, but slips away once the pressure’s gone, your oobleck is ready!

Show your kids how pressure turns the oobleck hard, but relaxing turns it soft and slippery!

what does oobleck look like

free printable traffic ispy game text with red car clipart and find traffic signals pdf

If your mixture gets too hard, add a little more water. If it gets too runny, add a bit more starch! If you use one or more boxes of starch, you’ll have tons of sensory fun to play with.

Kids (and adults!) are fascinated by this fun science experiment. It’s also a great sensory activity for kids with autism and those with sensory issues. Enjoy making this fun science experiment!

Steps and ingredients on how to make oobleck

Dear mom, I have so much more I’d love to share with you…

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    Filed Under: Activities for Kids, Sensory Activities Tagged With: indoor activity, sensory activity, STEM activityPublished on March 20, 2018

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    Comments

    1. svoemedia says

      April 3, 2018 at 6:49 pm

      I was wondering if I could switch the cornstarch with arrowroot starch? We don”t use cornstarch in our house for various reasons but loooove The fact that this is all natural. Although, it takes the mad scientist out of my daughter since it requires a stove as opposed to making a batch of slime all on her own when she feels like it.

      Reply
      • Erika says

        April 4, 2018 at 12:57 pm

        Yes, I have often substituted arrowroot or tapioca flour for cornstarch myself. Have fun!

        Reply
    2. Matthew says

      July 7, 2020 at 12:13 pm

      Really interesting! It’s very funny project and I can make some fun with my kids by doing this. Thanks for the share.

      Reply

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