If there is ever a time when I need to choose a sensory medium that will be the last we will ever have in the world, it would be Oobleck.
It is such a captivating medium! I often find myself still running my fingers through it long after the kids have finished.
Now Oobleck isn’t just any old liquid. It is special. It is neither a solid nor a liquid!
‘Say what?’ you may ask…
Yes, it shares properties of a solid AND liquid. This makes it fall under the category of being a non- Newtonian fluid. Under pressure, Oobleck is hard and mouldable however once the pressure is removed, it flows like a liquid!
Amazing isn’t it?
Now you might wonder, why call it Oobleck? Dr Seuss’ Book ‘Bartholomew and the Oobleck‘ is why!
So how do you make this mind blowing substance?
It’s SOOOO easy! Here is how we do it.
- Corn flour
- Food colouring (optional)
I like to get the kids to make it as it is really interesting watching the water and cornflour react with each other. Corn flour by itself is a unique powder. The particles are so fine, they squeak and feel so soft when they run their hands through it (or slap it like Miss 19m enjoyed doing)
I covered our round tray with corn flour and added a splash of food colour to a squeezy bottle before filling it with water.
The horses and zebras were thrown in just because… they could be used to stir, mix and scoop or be used to inspire a creative story.
Miss 19m was handed the bottle and given the honours of being the first to squirt some water into the tray.
Her small fingers wrapped around the bottle and with a squeeze, the fluid splashed into the tray and bounced off the corn flour before settling into small pools on the surface.
Miss 19ms attention drifted thrusting a plastic funnel into the corn flour to be rewarded with a plume of the powder floating off into the breeze. Miss 4 eagerly took charge of the water bottle and generously squeezed it into the tray.
The small pools quickly became larger ones before joining together. We started to run our fingers over the liquid, mixing the flour in sealed underneath. Our oobleck was coming together nicely!
Scraping the bottom of the tray, we retrieved handfuls of the mixture. Squeeze it and keep it moving, the mixture stays hard. As soon as you stop applying the pressure, the once hard ball liquifies and drops through your fingers.
Science is so much fun!
As our Oobleck slime began to dry out, we simply just squeezed more water into the tray and continued playing again!
It was lovely watching the colours swirl and mix together. This could be a great colour discovery activity! Primary colours in squeezy bottles squirted together to create blends- blue and yellow make green, blue and red make purple etc.
As the Oobleck dried, it left pretty patterns in our arms, grass, Miss 4’s hair and everything else within a 2 metre range from where we’re playing. Luckily, it washes clean just as easily as it is made- phew!
It’s safe to say that this non-Newtonian fluid is a favourite slime at our house. Give it a shot and let us know what your family think of it!
Dani D x
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