Mix water and cornstarch together in a small container.
Add food coloring until the mixture is the color you want.
Repeat for as many colors as you'd like!
There’s a fine line between the paint being too thin or too thick. If it’s too thick it will be difficult to spread on the sidewalk; too thin and it’ll drip everywhere. So you may have to add more corn starch or water to get the right consistency.
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