What is in a bath bomb that makes it fizz?
Two of the key ingredients to a bath bomb are citric acid and sodium bicarbonate. You might also know sodium bicarbonate by its more common name, baking soda. These two ingredients are what cause the impressive and delightful fizz when the bath bomb enters the water.
Do you drop bath bombs in before or after?
While it’s often debated which comes first, Vega says that dropping your bomb into a full tub is what lets it dissolve properly, unleashing all its lovely ingredients in the process. So wait for your tub to fill all the way up, then add your favorite bath bomb or oil.
How long do bath bombs last unused?
As with food products, bath bombs too have ingredients with an expiration date and a recommended shelf life. The shelf life of bath bombs refers to how long you can store them, and they still maintain full effectiveness. A bath bomb has an average shelf life of about six months.