Encourage your kids' inner artists! Make washable sidewalk paint with a few ingredients from the kitchen. All you need is cornstarch, water, and food coloring. Your kids will spend hours in the driveway creating masterpieces. And if you don't want to clean up, no problem—just wait for a summer rainstorm. Be sure to keep this recipe handy; your kids will want to play with this paint over and over again.
Measure equal parts of cornstarch and water. The more of each you use, the more paint you will have for the day. Mix the cornstarch and water together. At first the combination will be a bit tough to stir. Keep stirring until the mixture is smooth, with no lumps.
Pour small amounts of the paint base into individual cups or a muffin tin, one for each color you are making. Once there is paint in each container, add in food coloring. There is no specific ratio for how much food coloring to add. Stir the portion after each drop of food coloring so you can decide whether or not you want to add in another. Don't be limited to the hues in your food coloring box, mix them together!
Once the kids are done painting, clean up easily with a hose. For difficult spots, give it a quick scrub with soap and water. We didn't have issues with the food coloring staining the concrete. However, if you have light or porous stone we recommend doing a quick spot test to ensure it doesn't leave a stain. This paint also works on dark paper, cardboard, and poster board.
I did not use it on concrete. I used it on cardboard. The paint will stain concrete.