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Pour water into a mixing bowl and add 5-10 drops of food coloring.
Add 1 cup of cornstarch and stir until combined.
Add a second cup of cornstarch and stir until combined, using your hands if needed.
Check the consistency of the oobleck. It should behave as a liquid when resting, and as a solid when pressure is applied to it. If mixture is too runny, add more cornstarch; if it is too solid, add more water. Then, give it to your child to play with!