Goopy Magic: Make Your Own Oobleck!

Materials List
Equipment List
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Step 1

Lay down a tablecloth or newspaper on a flat surface or table. This will catch any mess you make.

Step 2

Pour 75g of cornstarch into your bowl using your scales to measure.

Step 3

Measure 50ml of water. Slowly pour the water into the bowl, stirring as you go.

Step 4

Mix the cornstarch and water with your spoon until it’s smooth and consistent.

Step 5

(Optional) Add a few drops of food colouring to make your oobleck bright and colorful.

Step 6

If you added food colouring, stir until the colour is spread out evenly.

Step 7

Dip the spoon into the oobleck. Lift it and see how the oobleck acts almost solid under pressure but flows like a liquid when you relax.

Step 8

Play with your oobleck! Squeeze it, poke it, or let it ooze through your fingers. Watch how it changes from solid to liquid and back again.

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FAQ

What is Oobleck named after?
obleck is named after a substance in Dr. Seuss’s book "Bartholomew and the Oobleck."
Why does Oobleck act like a solid sometimes and a liquid at other times?
Oobleck is a non-Newtonian fluid, which means it can act like a solid when you apply pressure but flows like a liquid when the pressure is removed. The cornstarch particles lock together under pressure, but slide past each other when the pressure is released.
Can I save my Oobleck for later?
Yes, you can! Store your Oobleck in a sealed container in the refrigerator. It might separate, but a quick stir will bring it back to life.
How do I clean up after playing with Oobleck?
Oobleck cleans up easily with water. Avoid pouring it down the drain, as it can clog pipes. Instead, let it dry and then throw it away as solid waste.