2-Ingredient Goop Recipe: Is it a solid? Is it a liquid? It’s BOTH? What is this mysterious substance? It’s GOOP, also known as homemade Ooblek, and it’s one of the funnest, most amazing science activities ever! It’s a fabulous sensory experience too, and all you need are two basic ingredients to make it!
We’re no strangers to simple scientific concoctions here in my home daycare. We love clean mud and cloud dough, but Goop is the most fascinating sensory substance of all! If you’ve never made it before, you’ll wonder why you waited so long!
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What is goop?
Goop is a fun sensory goo named after the substance in the Dr. Seuss book “Bartholomew and the Ooblek“. Goop is a non-newtonian fluid that seems to magically change from a liquid to a solid when handled. When you squeeze it, it becomes a hard, crumbly mass, and when you release it, it transforms into an ooey, gooey, goopy liquid. It’s absolutely mesmerizing to play with.
How do you make Goop?
With just two ingredients: water and cornstarch!
If you’ve ever combined the two while cooking or baking, you’ve seen goop in action. Resting in a bowl, you have a white, gooey liquid but apply a bit of pressure to it, and the liquid firms up so much you can hardly stir it.
Have you ever wondered how it would feel to sink your hands into this extraordinary substance. Well, now you can! And I can tell you, it’s pretty awesome. You should’ve heard the hooligans shrieking and squealing as they played with it.
This batch of homemade goop held the kids’ attention for about an hour, and they would’ve played longer but we had to clean up for lunch.
To make our 2-Ingredient goop recipe, you’ll need:
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- cornstarch (known as cornflour in the U.K.)
- cold water
- shallow pan, bin or baking sheet
- Liquid Watercolors
Let the kids mix it by hand!
I started by dumping a generous amount of cornstarch onto a baking sheet. I didn’t measure but it was probably a cup and a half.
I gave the hooligans a minute to explore the starch with their hands. The fine powder feels so silky and soft.
Then I poured about a cup of water onto the tray, and asked them to mix it and mash it together with their hands.
I added more cornstarch and water as they were mixing until we got the consistency we were looking for. You’ll know it when you get there. Your goop will become solid when you squeeze it or push it around on the tray, and it will transform back into an oozing liquid when you release it.
Add some colour if you like:
We played with the all-white goop for a while, and then I thought it would be fun to add some colour.
I sprinkled about a half-dozen drops each of red and blue Liquid Watercolors on to the surface of the goop, and the hooligans got to work mixing it in to the concoction. This took a while because of how resistant the cornstarch and water mixture is to pressure. We really had to work hard to blend the colour with the goop. It was great exercise for those little fingers and hands.
Of course, we ended up with purple goop, which was a great little lesson in colour-mixing.
Isn’t it amazing?
Squeeze it together, and you get a solid lump.
Let it go and it slithers away between your fingers. Marvellous!
The girls loved it when I scooped a big handful of goop and held it up high, and let it drizzle down over their hands. They’d grab for the gooey strands of goop and watch as their own grasp would turn them back into solid form again.
What a wonderful, hands-on way to explore the properties of cornstarch and water!
Easy clean up!
Cleaning up our goop experiment was a breeze! It all washed away in seconds with a spray from the garden hose!
Looking for more amazing sensory substances you can make with cornstarch? Check out:
2 ingredient Cloud Dough – Happy Hooligans
Coloured Cloud Dough – Happy Hooligans
3 Ingredient Moon Sand – Skip to My Lou
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