Mix vinegar, baking soda, cornstarch and corn syrup together in a small bowl.
Divide the mixture into several small plastic tubs or jar lids.
Add six to eight drops of food coloring to each tub or lid then mix.
Use Wacky Watercolors as they are or let them dry into hard cakes of paint. If you use them while they're dry, be sure to wet the paintbrush before painting.