Starry Night Bath Bombs

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Whether you call these Starry Night Bath Bombs or make them as a special Halloween Bath Bomb, one thing is guaranteed: these gorgeous, super simple bath bombs will transform your bath into a magical, relaxing experience.

Magically transform your bath using these DIY Starry Night Sky Bath Bombs - so incredibly easy to make and so much fun to use!

Halloween Bath Bomb Recipe

Bath bombs are one of our favorite DIY gifts to make for friends.

They are so incredibly easy, you can customize them exactly to your recipient’s interests and scent/color preferences, and they are super affordable to make, especially when compared to the specialty ones you can find in stores.

These bath bombs started out as a Witch’s Brew bath bomb (and mixing the ingredients together does kind of feel like you’re making a witch’s brew), but since all of the sprinkles we used had a night sky theme, I’m think they would work for any time of year!

The gorgeous blue and pink mica powders look purple in the finished bath bomb, but when released into your bath water they create a gorgeous swirl of colors that looks like a beautiful starry night sky.

If gifting these bath bombs, a pretty cardboard box or large mason jar makes the perfect container and will prevent them from being damaged.

Typically, a store-bought bath bomb will run you $5+ and buying all of the ingredients for bath bombs will initially cost probably about $25 if you have none of the ingredients on hands. However, that $25 is enough to make easily 100+ (small) bath bombs – and you can also use many of these materials in different ways:

  • Epsom salts can be used to make custom bath soaks, or just sprinkle it as-is in the bath after a work out or stressful day
  • Citric Acid is a food additive that can be used in DIY cleaners, canning food, or you can make your own fizzy sherbet with it (it’s also used in home brewing!)
  • Corn Starch is a great thickener used for sauces like gravy or with mac and cheese, or you can make oobleck with it (a fun sensory play material)
  • Baking Soda is great for cleaning, is used often in baking, and you can make fun fizzy science experiments with it
  • Coconut Oil is an awesome substitute for butter or oil in baking/cooking, and there are lots of holistic ways it can be used (I used to actually massage and wash my face with it when I had  some post-partum pimples and we often add it to our homemade sugar scrubs)

Night Sky Bath Bomb Materials

  • Baking soda – this is the essential ingredient for those fizzy reactions. It also helps exfoliate and is anti-bacterial and anti-inflammatory
  • Citric acid – if not ordering online, citric acid can be found at pharmacies, but we got the best deal ordering ours through a home brewery store — it is a food additive, nothing to be worried about. Citric acids serves to neutralize the baking soda in bath bombs and helps your skin absorb the benefits of the other ingredients
  • Bentonite Clay – (benefits)
  • Epsom salts – be sure to purchase quality epsom salts that are 100% magnesium sulfate. Cheaper epsom salts may contain unnecessary additives
  • Coconut oil – reduces the amount of water needed to bind the bath bomb. Any quality/edible oil can substitute
  • Essential oils* – optional, pick them for either their scent or suggested benefits
  • Polysorbate 80 – since we’re using a bit more dye than normal, this will help it not stick to your bath tub
  • Pink and Blue Mica Powder – can use soap coloring
  • Night Sky or Witch-themed Sprinkles <– I used this blend from Etsy
  • Alcohol – to wet the mixture and avoid it drying out, without adding water (which would activate the bath bomb)
  • Corn starch – corn starch slows down the reaction time of the bath bomb and helps them retain their scent

Scroll down to the printable recipe card for full measurements.

Tip: the bath bomb mixture should be a bit like damp sand – not wet or sticky, but able to hold a shape if squeezed.

Kitchen Tools You May Find Helpful

  • Measuring Cups and Spoons
  • Metal Bath Bomb Molds
  • Mixing Bowl
  • Whisk

How to Make a Night Sky Bath Bomb

  1. Whisk together the baking soda, citric acid, clay and epsom salts. 
  2. In a second bowl, combine the melted coconut oil, essential oil blend and polysorbate 80 together, mixing well. 
  3. Add liquid ingredients 1 tsp at a time to the dry ingredients, mixing it together slowly so as not to start the fizzy reaction. 
  4. Add the pink and blue mica powder and stir until the color is consistent throughout. If you would like a more intense color, add more mica powder in 1 tsp increments, stirring between each increment until you have a dark color. Keep in mind that the color will fade a little when the mixture dries.
  5. Dust the bottom of one side of the bath bomb mold with cornstarch. The sprinkle side tends to come out on its own, so do not bother to dust that side with cornstarch.
  6. Place about 1 tsp of sprinkles in the non-dusted side of the bath bomb mold. 
  7. Immediately pack each side of the bath bomb mold with the mixture. Pack extra bath bomb mixture between the two molds, then press the two sides together, grinding and pressing them to force the two together.
  8. Allow the bath bombs to rest in the mold for up to 24 hours before gently tapping the top and side of the mold to release the bombs.
  9. Use your bath bombs immediately or store in an airtight container until you’re ready to use!

Pin this DIY Bath Bomb Recipe:


Grab your free printable for our starry night bath bombs recipe:

Yield: 5 bath bombs

DIY Starry Night Bath Bomb

DIY Starry Night Bath Bomb

A gorgeous and customizable starry night bath bomb perfect for Halloween or any night that could use a bit of magic.

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

Materials

  • 1 1/2 cup baking soda
  • 3/4 cup citric acid
  • 1 tbsp bentonite clay
  • 1 tbsp epsom salts
  • 2 tbsp melted coconut oil
  • 1/2 tsp essential oil blend, optional
  • 1/2 tbsp polysorbate 80
  • 1 tsp pink mica powder
  • 1 tsp blue mica powder
  • 2-4 tablespoons witchy sprinkles blend
  • 1/2 tsp alcohol
  • 1/2 tsp cornstarch

Tools

  • 4-5 bath bomb molds
  • Mixing bowl
  • Measuring cups and spoons
  • Whisk

Instructions

  1. Whisk together the baking soda, citric acid, clay and epsom salts. 
  2. In a second bowl, combine the melted coconut oil, essential oil blend and polysorbate 80 together, mixing well. 
  3. Add liquid ingredients 1 tsp at a time to the dry ingredients, mixing it together slowly so as not to start the fizzy reaction. 
  4. Add the pink and blue mica powder and stir until the color is consistent throughout. If you would like a more intense color, add more mica powder in 1 tsp increments, stirring between each increment until you have a dark color. Keep in mind that the color will fade a little when the mixture dries.
  5. Dust the bottom of one side of the bath bomb mold with cornstarch. The sprinkle side tends to come out on its own, so do not bother to dust that side with cornstarch.
  6. Place about 1 tsp of sprinkles in the non-dusted side of the bath bomb mold. 
  7. Immediately pack each side of the bath bomb mold with the mixture. Pack extra bath bomb mixture between the two molds, then press the two sides together, grinding and pressing them to force the two together.
  8. Allow the bath bombs to rest in the mold for up to 24 hours before gently tapping the top and side of the mold to release the bombs.
  9. Use your bath bombs immediately or store in an airtight container until you’re ready to use!

Pin this Project for Later

Please leave a comment on the blog or share a photo on Pinterest

These DIY Bath Bombs are so easy to make and magically transform your bath into a pretty night sky, with swirls of color and a light scent.

For another fun Starry Night-inspired crafts, check out our Starry Night Painting Activity that incorporates growing your own crystal stars – or for grown-ups, check out our Shimmering Purple Cocktail recipe.

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One Comment

  1. Everyone loves Art and Craft. They only need an Idea. I also love Art and Craft. I like your Ideas very much. Thanks for this always. Looking forward for some new ideas from you.

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