Saw a similar idea on Little Bit Funky and had to try it out. My kids loved it!
Here's what you need:
Here's what you do:
1. Mix equal parts cornstarch and water, stir until the cornstarch is completely dissolved. I used one cup of cornstarch and one cup of water.
2. Divide the mixture between bowls for your paint colors (we used six bowls for that many colors).
3. Add food coloring to the bowls and stir.
4. Go outside and paint!
5. When want your artistic creations to go away, simply spray with a hose.