It’s simply 1 part cornstarch to 1 part water.
I made two muffin tins of paint and used 1-1/2 cups cornstarch and 1-1/2 cups water. Once it was all mixed up, I divided it among the 12 muffin cups, and added two drops of food coloring to each muffin cup.
My kids had a blast! And even with the food coloring, the paint didn’t stain. It came off the driveway, shoes, clothes, hands, and legs without staining a thing.
Thanks to Domestic Charm for giving me this fun idea!