what ingredients are in elephant toothpaste?
['A clean 16-oz plastic soda bottle.', '1/2 cup 20-volume hydrogen peroxide liquid (20-volume is a 6% solution; you can get this from a beauty supply store or hair salon)', '1 Tablespoon (one packet) of dry yeast.', '3 Tablespoons of warm water.', 'Liquid dishwashing soap.', 'Food coloring.', 'Small cup.', 'Safety goggles.']