Start by grating a sidewalk chalk piece into a measuring cup that pours. Use a small grater if you can so that you can grate directly into the cup. If you don't have a small grater, then grate into a larger bowl and then transfer to a pouring cup. We used about half a sidewalk chalk piece per color.
Add 2 tablespoons of cornstarch into the measuring cup.
Add 4 tablespoons of water.
Mix with a whisk.
Pour the mixture into an ice cube tray or small plastic container.
Repeat for each color you'd like to make. Double or triple the recipe to make a larger batch. This recipe will fill 2-3 ice cubes.
Add mini popsicle sticks into the ice cube trays. You can lean them to one side to keep them standing up.
Once frozen, let the ice cube tray sit out for a few minutes so that you can easily pull the paintsicles out.
Each recipe will make 2-3 ice cubes. Double or triple the recipe to make a larger batch. See our clean-up tips above before using.