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Rainbow Oobleck

to make each color mix corn starch (corn flour in UK) with just enough water to make it a liquid when picked up but a solid when touched. Then add what food color you want to use and mix. 
We did a rainbow to learn the colors of one, also great for color mixing.

what is oobleck?~
Oobleck is a classic science experiment that's perfect for entertaining both kids and adults. If you haven't seen it in action it's very fascinating stuff and before too long you'll have your hands covered with it, happily making a mess that can be washed away with water.

Oobleck is a non-newtonian fluid. That is, it acts like a liquid when being poured, but like a solid when a force is acting on it. You can grab it and then it will ooze out of your hands. Make enough Oobleck and you can even walk on it!

Oobleck gets its name from the Dr. Seuss book Bartholomew and the Oobleck where a gooey green substance, Oobleck, fell from the sky and wreaked havoc in the kingdom. Here the Oobleck will be made in a bowl and will likely make a mess, but only because you can get carried away playing with it.

read more here~http://www.instructables.com/id/Oobleck/

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So neat!