Fun, Fizzy Bath Bombs

We’re all looking for fun projects to keep our kids busy these days. Making these bath bombs together serves many purposes! Kids will love mixing up the ingredients, the project can serve as a mini science lesson on acids and bases, and your finished product will add some extra excitement to bath time. (The same thing that makes a baking soda and vinegar “volcano” erupt is the same thing that makes bath bombs fizz. Although with bath bombs, the powdered citric acid takes the place of vinegar, and doesn’t start producing carbon dioxide bubbles, i.e. fizzing, until added to water.) 

Another plus: You can customize your bombs to your tastes. So if your kiddo is sensitive to fragrances or dyes, leave out the essential oils or food coloring.

Pro tips: I like to halve this recipe so my two kids can each choose their own color and fragrance combinations. You can find citric acid, a common ingredient in home canning, in the canning aisle of Winco and other groceries stores, or online. And you know you’ve already got some coconut oil at home. 


Fizzy Bath Bombs

1 cup baking soda
½ cup citric acid
½ cup Epsom salt (optional)
½ cup cornstarch
1 teaspoon water
3 tablespoons melted coconut oil, or olive oil
Essential oils or vanilla extract (optional)
Food coloring (optional)
Rainbow nonpareils (optional)
Silicone molds, round bath bomb molds or mini cupcake tray
Rimmed cookie sheet

Courtesy Denise Castañon


  1. Place baking soda, citric acid, Epsom salt and cornstarch in a large bowl. Stir with a whisk.
  2. In a small bowl, mix water, coconut oil, several drops of essential oil or ½ teaspoon of vanilla extract, and 3-5 drops of food coloring (or more if you desire a brighter color) with a fork.
  3. Sprinkle a small amount of rainbow nonpareils into the bottoms of your molds. (For an easier cleanup, place molds on a rimmed baking sheet that can catch spills.)
  4. Slowly add coconut oil mixture to the large bowl a little bit a time, stirring well after each addition. It will fizz up a little, that’s OK, just keep stirring. (The stirring is a great job for a kid!) After all the coconut oil mixture is added, the mixture should have the consistency of wet sand. It can be mixed by hand, but be sure to wash hands well before rubbing eyes!
  5. Working quickly, add the bath bomb mixture to the molds. Pat down so it is packed into the mold. Set aside to dry for several hours.
  6. When bombs are dry, pop out of molds and store in a large, zip-top bag. Enjoy a fizzy bath time! 
Denise Castañon
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