In a large bowl, combine baking soda, citric acid, cornstarch, epsom salt and a small amount of cosmetic pigment powder (less than a teaspoon) or a few drops of gel food coloring.

Combine coconut oil and essential oil then stir into dry ingredients.

Spray a few pumps of witch hazel until the mixture can hold its shape.

Firmly press into snowflake mold. Let bath bombs dry for a few hours or overnight before gently removing from mold.