To make a fizzy bath ball at home, mix citric acid, cornstarch and baking soda with vegetable oil, fragrance oil and food coloring, if desired. Form into balls, and let sit for three days to dry before adding to the bath. Alternatively, use molds to make different shapes, or use soothing Epsom salts in place of the cornstarch.
In a small bowl, mix 2 tablespoons of citric acid, 2 tablespoons of cornstarch and 1/4 cup of baking soda. In another bowl, mix 3 to 6 drops of food coloring, 1/4 teaspoon of fragrance oil and 3 tablespoons of vegetable oil, such as coconut oil, avocado oil or olive oil. Omit the fragrance and food coloring, if desired. Mix the dry and wet ingredients together, and then form the mixture into one-inch balls. Place the balls on waxed paper, and let them dry for two to three days before using or storing them in a sealed container.
A simpler fizzy bath bomb recipe omits the citric acid and cornstarch and uses soothing Epsom salts instead. Mix 2 cups Epsom salts, 2 tablespoons of water, desired essential oils and food coloring in a small bowl. Pack the mixture generously into a mold, and let stand for two to three days before using.