Citric acid and baking soda (aka sodium bicarbonate) are the two main ingredients in bath bombs. That combination creates the fun fizzy reaction when the bath bomb is introduced to water. Additional ingredients can be added, such as oils, fragrance, color, glitter, and more. Then the mixture is molded into fun shapes.
But, at the core, bath bombs are baking soda and citric acid. The most common bath bomb recipe is 2 parts baking soda to 1 part citric acid. Citric acid is a mild preservative that’s often used in canning and other applications like candy making. It can be a little tricky to find in stores, which is why some recipes call for substitutions. So, can you make bath bombs without citric acid?
The combination of citric acid and baking soda produce the best, most fizzy bath bomb.
Lemon Juice Bath Bomb:
1 cup baking soda
Lemon juice (until moldable texture)
Cream of Tartar Bath Bomb:
1 cup baking soda 1/2 cup cream of tartar
Witch hazel (until moldable texture)
Cornstarch Bath Bomb:
1 cup baking soda 1/2 cup cornstarch
Witch hazel (until moldable texture)