Galaxy Bath Bomb

Making bath bombs can be a fun way to liven up bath time! This galaxy bath bomb activity will make your bathtub seem like an out-of-this-world oasis. 

What You’ll Need:

  1. 1/2 cup baking soda 
  2. 1/4 cup citric acid 
  3. 1/4 cup cornstarch 
  4. 1 tablespoon oil (almond or other) 
  5. Food or soap coloring
  6. Rubber band 
  7. Bath bomb mold (can be a plastic ornament or something similar) 
  8. A few drops of essential oil (OPTIONAL)


  1. Mix dry ingredients in a bowl (baking soda, citric acid, cornstarch). 
  2. Add oil (almond or other) slowly to the bowl, drop by drop.
  3. Add essential oil (OPTIONAL). 
  4. Divide mixture into several smaller bowls. 
  5. Add a different color to each bowl by adding one drop at a time. 
  6. Coat your mold lightly with oil. 
  7. Fill both sides of your mold with the mixture. 
  8. Close mold and twist both sides together. 
  9. Wrap a rubber band around the mold to make sure it says closed. 
  10. When you open your mold, don’t twist. Pull apart slowly with your finger nails. 
  11. When ready to use, drop the bath bomb in your bathtub!

Galaxy Bath Bomb

This project was inspired by an activity here.

Check out other science and math activities from Camp Little Victors:

Find additional science and math activities from Camp Little Victors.