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Making Homemade Bath Bombs

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6 buddy reviews
by Teisha Rowland, PhD
Active Time
30-45 minutes
Total Project Time
1 to 2 days
Key Concepts
bath bombs, chemical reactions, acids, bases, carbon dioxide
Picture of homemade sea-shell shaped bath bombs.


Have you ever had a refreshing bath using a bath bomb? It can be quite the relaxing experience, especially if your bath bomb has a nice fragrance or includes some bath salts. Have you ever wondered what causes a bath bomb to become so fizzy when it touches the water in the bathtub? It is due to a chemical reaction taking place between different ingredients within the bath bomb. In this activity, you will get to make your own homemade bath bombs and explore how changing the amounts of the different ingredients affects how fizzy the bath bombs end up being when you toss them in the bath. You can use your perfected method to create some super satisfying bath bombs!


Teisha Rowland, PhD, Science Buddies
This activity is not appropriate for use as a science fair project. Good science fair projects have a stronger focus on controlling variables, taking accurate measurements, and analyzing data. To find a science fair project that is just right for you, browse our library of over 1,150 Science Fair Project Ideas or use the Topic Selection Wizard to get a personalized project recommendation.


  • Bath bomb starter kit, available online through Amazon.com. Alternatively, you could purchase citric acid, baking soda, food coloring, and cornstarch separately. Epsom salts and fragrance are optional.
  • Water
  • Vegetable oil
  • Medicine dropper
  • Medicine spoons
  • Forks and spoons for mixing
  • Four bowls
  • A muffin tray, such as this one available online through Amazon.com. Alternatively, you may use an ice cube tray. If you use an ice cube tray, you will need to dry the bath bombs overnight at room temperature. If you use a muffin tray, you can dry the bath bombs overnight or for one hour in an oven. If you live in a very humid environment, it is recommend to use the oven to dry the bath bombs after making them, but you can only use the oven if you are using a muffin tray.
    Materials for doing the bath bomb activity.
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Active Time
30-45 minutes
Total Project Time
1 to 2 days
Key Concepts
bath bombs, chemical reactions, acids, bases, carbon dioxide