@simply_kay.c
Planet Bath Bombs
Learn about chemistry and design out-of-this-world bath bombs! Mix together citric acid, baking soda, cornstarch, and food coloring to make your bath bomb base before pressing into molds. Smush and sprinkle the colors on top of each other to create planetary layers before dropping them in the bath and watching them fizz!
Why it’s awesome
Just add water
Everything you need to make four multicolored bath bombs.
Planetary fun
Create bath bombs inspired by real-life and make-believe planets.
Fizzy chemistry
Experiment with scents, colors, and more to make custom bath bombs.
What’s included?
Topics explored
Chemical reactions
Mixing colors
Planetary layers
From the desk of the product designer:
Behind the design
“We wanted to make the bath bomb experience more educational. Now kids can learn about the anatomy of a planet while making their bath bombs, from core to crust!”
- KiwiCo Product Designer
By the numbers
67
Planets created during testing
51
Planets cut open
4
Test baths
Reviews
4.6
21 reviews
Customer images
Katelyn
02/10/2025
Great fun! Turned out great. Did this with my three and five year old
Christine
08/04/2024
So fun and awesome that it gives the measurements for the recipe to make them over and over again. My daughter has started making these as teacher and birthday gifts ?
Frances
10/23/2023
I did this project with my 9 year old and he loved every step! We were worried that the consistency wasn't right but once the bath bombs dried, they held together perfectly.
Arianna
03/04/2023
I liked making them, but I thought the color would stay longer and that it would be more sudsy when I bathed with it.
Kelley
12/27/2022
My son loved making these and then using them at bath time. He had fun doing the store by step process and doing different color combos. He could not believe how fizzy they were when he got to used the finished product. He made a total of 5 bath bombs. This was such a good gift.
Carie
12/16/2022
Perfect gift for my Granddaughter
Added