Stir together the water and cornstarch in a medium mixing bowl.
Pour the cornstarch mixture into the a 6-cup muffin tin, dividing equally among the cups.
Stir about a teaspoon of food coloring into each cup.
Use a paint brush to paint on the sidewalk or pavement.
Video
Notes
Food Coloring:We used plant based food coloring so it would be easier to wash away, but you can use any food coloring that you have on hand.Clean-Up:Use a garden hose to wash away your artwork. It washes away very easily if you do so the same day. You can also leave the artwork until it rains.