This Rainbow Bath Bomb Recipe Makes a Great Gift

This rainbow bath bomb makes a great gift because it packs a powerful one-two punch: bright colors and a relaxing bath fizzy recipe that really bubbles!

two rainbow bath bombs on a white background

Rainbow Bath Bombs

Here at Ruffles and Rain Boots, I absolutely love making bath bombs for gifts and, of course, for my daughter and I. Her favorite is still this little fizzy mermaid bath bomb funbut I always try and one-up myself.

The way these rainbow bath bombs turned out is nothing short of fabulous. And the “hardest” part is separating the mix – yeah, they’re super easy. Let’s get started.

No Time to Make This Now? Pin it for Later

Too busy now? Pin this to your favorite ‘how to make rainbow bath bombs’ board on Pinterest and it’ll be here for when you’re ready.

photo collage of how to make rainbow bath bombs and finished rainbow bath bombs with text which reads rainbow bath bombs

Tips to Make This Rainbow Bath Bomb Recipe

  • For a longer fizz-time, make a bigger bath bomb in the largest mold you have and REALLY pack the mix. A solid bath bomb will take longer to fizzle out.
  • Please don’t use food coloring. Your tub will likely stain with the red or blue and no one wants that.
  • This is a super-colorful recipe and would be perfect for anyone, male or female.

two rainbow bath bombs on a white background

How Do I Make these Rainbow Bath Bombs?

I’m so glad you asked. Below is our written tutorial. If you’re making a bath bombs playlist on YouTube, here is our How to Make Rainbow Bath Bombs video tutorial.

Yield: 2 to 4, depending on bath bomb mold size

Rainbow Bath Bomb Recipe

two rainbow bath bombs on a white background

Make these fun rainbow bath bombs with just a few ingredients from the kitchen. The color and bubbles from this easy bath fizzy recipe will WOW everyone.

Prep Time 10 minutes
Active Time 10 minutes
Drying Time 1 day
Total Time 1 day 20 minutes
Difficulty Easy


  • 1/2 cup baking soda
  • 1/2 cup citric acid
  • 1/4 cup melted coconut oil
  • 1/4 cup cornstarch
  • Therapeutic grade essential oil (like peppermint or lavender scented) 
  • Bath soap colorant: red, yellow, orange, green and blue.


  • Circular bath bomb mold
  • Bowl
  • Whisk or spoon
  • Plastic gloves, optional


  1. Mix together the baking soda, citric acid and cornstarch. 
  2. Melt the coconut oil and add in a few drops of essential oil. 
  3. Add the coconut oil mix to the dry ingredients slowly so the mixture doesn’t fizz. 
  4. Place 1/4 cup of the mix in 5 bowls. Add a few drops of each soap colorant to each and mix. 
  5. In one side of the bath bomb mold, add red, then orange. In the other side of the mold, add blue, then green.
  6. Add yellow to each, slightly overflowing and then press the molds together. Twist slightly and carefully remove the rainbow bath bomb.
  7. Set aside to dry overnight. how to make rainbow bath bombs tutorial photo collage


For more amazing bath bomb recipes, visit

Did you make this?

Please leave a comment or share a photo and tag me @rufflesandrain

More Bath Bomb Recipes You Might Like

  • Basics of How to Make Bath Bombs – If you’re still sketchy about how to make rainbow bath bombs, you absolutely have to check out this quick tutorial so you’ve got all the details before you dive-in.
  • Rainbow Foot Soak – This is the easiest way to get rough, tired feet feeling refreshed.
  • Stunning Mermaid Bath Bombs (2 Ways!) – I highly recommend these adorable and absolutely stunning mermaid bath bombs when you need to give a beautiful gift to a friend.

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photo collage of how to make rainbow bath bombs and finished rainbow bath bomb with text which reads easy rainbow bath bombs

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