The colors are quite vivid, and you can sneak in a quick lesson about color mixing and how to measure. Our driveway has a slight slope, so just as we were finishing up, Emily dumped the paint to make this "rainbow".
To make your own homemade sidewalk chalk paint, you will need: 2 tablespoons of cornstarch, 2 tablespoons of water, and 4-5 drops of food coloring. Be sure to add the cornstarch and THEN the water so it mixes up a little easier. Emily really enjoyed making this paint!
1 pound box of cornstarch (store brand) -- $2.25
1 box food coloring (on sale) -- $2.50
Total Spent = $4.75
I should also note that we use food coloring for LOTS of projects, and this only calls for a few drops. Also, I had lots of cornstarch left over, so we will be using that for future projects as well.