· 2 cups baking soda
· 1/2 cup cream of tartar
· Essential oil (optional)
· Food color (optional)
Step 1: Combine the baking soda and cream of tartar together. Add the essential oil and color if desired, and mix thoroughly.
Step 2: Add 1 teaspoon of water at a time, mixing after each one is added, until you can squeeze the mixture in your hand and it clumps together. If the clump begins to fall apart, you need to add a bit more water.
Step 3: Press the bath bomb mixture into the molds, making sure it is packed very tightly and let set for a few minutes. Gently tap the bath bombs out of the mold and let them dry overnight.