I’m not Playing–These Galaxy Bath Bombs are Epic and Fun!

You’re not going to find a more easy way to make galaxy bath bombs that are just so fun you’ll love them. Plus, they’re cute, so they make an awesome gift!

galaxy bath bomb recipe with sprinkles
I had so much fun making these easy galaxy bath bombs–and the kiddo is LOVING letting her galaxy bath bombs fizz!

Galaxy Bath Bombs

Here at Ruffles and Rain Boots, we are all about the DIY bath bomb around here. The kiddo has a blast getting into the tub with the fizzies and sometimes it’s all I need to get her excited to take a bath, rather than moping about having to get ready for bed. It’s like a magic tool I can say “guess what I have” instead of “going to bed is imminent”. Who doesn’t love that?!


Plus, these fun DIY galaxy bath bombs are so colorful (despite being mostly black), they’re really eye-catching. They make an awesome gift for a neighbor or friend. Which is out of this world cool! LOL! If you’re ready to make a fun galaxy themed bath bomb, let’s get started.

easy galaxy bath bomb recipe
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closeup of black bath bombs with star sprinkles with text which reads galaxy bath bombs

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Tips to Make DIY Galaxy Bath bombs

  • To get the fun gold line running through the center of the galaxy bath bombs using gold edible glitter, you need to either make the alcohol/glitter mixture very thick or you can plan on painting a couple of coats. It dries really fast, so doing multiple coats is quick. You can grab the edible glitter I used here.
  • Make sure you plan ahead to let your bath bombs dry about 24 hours before using them–that way you get the best fizz. Plus, this gives you a chance to let the mixture dry out really well, just on the off chance you got it a little too wet.
  • Before you make your bath bombs, you should also plan on what airtight container you’re going to put them in, whether that’s a mason jar, Tupperware or zipper baggie, so that they’ll last longer and give you the most fizz over time.
  • Because these bath bombs are all you–I mean, you are the one making them, after all, you can do what you want, but I really recommend avoiding the use of food coloring–like the plague. If you use food coloring, you’ll end-up coloring both the bathtub and your skin. So, even though you might have to wait a few days for soap colorant or mica powders to be shipped, it’s worth it in the long run.
  • These galaxy bath bombs are essentially just a combination of essential oils, citric acid, and a bit of water (also a few other things but that’s the basic gist), just like all of my bath bomb recipes. So, if you have any trouble getting them to hold shape, they’re likely not moist enough–the recipe is intended to be a bit dry, but it’s ok to add a little spritz of water and try again. But if you keep having trouble, check out this article on trouble-shooting bath bombs and shower fizzies.
quick and easy recipe to make galaxy bath bombs

How Do I Make Galaxy Bath Bombs?

I’m so glad you asked. Below is our written tutorial.

Yield: 12 Fun Galaxy Bath Bombs

Galaxy Bath Bombs

quick and easy recipe to make galaxy bath bombs

Making these fun galaxy bath bombs is so simple and the result is so wildly fun, you're going to really enjoy the fizz!

Prep Time 5 minutes
Active Time 15 minutes
Total Time 20 minutes
Difficulty Easy
Estimated Cost $3


  • 1 cup baking soda
  • 1/2 cup citric acid
  • 1/2 cup cornstarch
  • 1/4 cup epsom salts
  • 2 tbsp melted coconut oil
  • 1/2 tsp essential oil blend desired (or coconut and lemon extract, since that’s what I wanted)
  • 2 tsp witch hazel
  • 1/2 cup charcoal
  • 1 tsp pink mica powder
  • 1 tsp blue mica powder
  • 5-6 tablespoons galaxy sprinkle mix
  • Gold edible glitter
  • 1/2 tsp alcohol



  1. Combine the baking soda, citric acid, cornstarch and epsom salts. 
  2. In another bowl, stir together the melted coconut oil and witch hazel. 
  3. Add the wet ingredients, about 1 tsp at a time, to the dry ingredients, stirring slowly so as not to kick up the fizzing. 
  4. Split out about 1/2 cup of the bath bomb mixture into two separate small bowls.
  5. In one of the smaller bowl, add the pink mica powder colorant and stir to combine, then repeat with the blue mica powder in the other small bowl. To the remaining large bowl of bath bomb mixture, add the charcoal and stir until the color is consistent throughout.
  6. Dust the inside of one half of a bath bomb mold with cornstarch. Because the side of the bath bomb with the sprinkle tends to just come out on its own, so I don't feel the need to dust that side with cornstarch.
  7. In the non-cornstarch-dusted side of the bath bomb mold, place about 1 tsp of the galaxy sprinkles. 
  8. Pack the sprinkles-side of the mold full of the black bath bomb mixture to just about 2/3 full. Then add about a tsp of pink bath bomb mixture spread from side to side, then add about a tsp of black mixture to top off the mold.
  9. In cornstarch-dusted bath bomb mold, pack it about 2/3 full of the black mixture, followed by a tsp portion of blue bath bomb mixture spread from side to side, then topped with an additional tsp of black mixture to top it off. photo collage of how to make galaxy bath bombs
  10. Pack a little bit of extra black bath bomb mixture between the two molds, pressing and grinding the two sides together to force the two sides to combine.
  11. To release the bath bomb from the mold, allow the bath bombs to rest in the mold for up to 24 hours, then gently tap the sides of the mold and the bath bombs will pop right out.
  12. To add the gold stripe to the middle of the bath bombs, combine about 1 tsp of edible gold glitter and alcohol in a small bowl, then paint a stripe of the glitter mixture to the middle of each bath bomb.
  13. Use your bath bombs immediately or store in an airtight container until you’re ready to use! photo collage of how to make bath bombs with a galaxy theme with sprinkles


For more easy DIY bath and body ideas, visit Ruffles and Rain Boots!

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Did you make this?

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More Bath and Beauty Ideas You Might Like

  • Unicorn Bath Bombs – These fun unicorn bath bombs are so pretty and SUPER quick to come together. You can have them done in about 15 minutes!
  • Cotton Candy Bath Bombs – Some of my favorite bath bombs–smell so good and easy to make. They’re perfect all the way around.
  • Geode Bath Bombs – This trick to make geode bath bombs are the most cool bath bomb I think I’ve ever made!
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photo collage of easy bath bomb recipe with text which reads galaxy bath bombs

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