DIY Birthday Cake Sprinkle Bath Bombs

Cotton Candy Bath Bomb Recipe
Supplies:
1 cup baking soda
1/2 cup citric acid (It’s better to buy in bulk on Amazon)
1/2 cup SLSA (Sodium Laurel Sulfoacetate) (Find it on Amazon)
1/4 cup cream of tartar
1/4 cup coconut oil
2 tablespoons rubbing alcohol
10 drops Vanilla cake scent
Light blue mica powder (Find it on Amazon)
Spray bottle of rubbing alcohol
Rainbow nonpareils or sprinkles
1 large mixing bowl
Bath bomb molds (I recommend these you can find on Amazon)

Directions:
Steps 1-4: Add dry ingredients to a large bowl.

Step 5: Sift or whisk dry ingredients.

Step 6: Add mica powder

Step 7: Using your hands, break down any lumps in the dry mixture while incorporating the mica into the dry
ingredients.

Step 8: Add lavender essential oil

Steps 9-10: In a small microwave-safe bowl, melt coconut oil in the microwave for 25-30 seconds. Add cotton candy scent to
oil.
Step 11: Add liquid to dry mixture, 1 tablespoon at a time.

Step 12: Whisk liquid or use your hands to incorporate into dry mixture.

Step 13: If mixture is still too dry, spray rubbing alcohol a bit at a time and incorporate into dry mixture using your
hands.

Step 14: You will know when the mixture is perfect when it feels like wet sand and you can press the mixture together in
your hands and it stays together. **Please note** You may need to use your spray bottle of rubbing alcohol to spritz
your mixture if it gets too dry as you are adding it to your mold. Give a few spritzes and mix together until it has that wet
sand feel again.

Step 15: If you like, add a bit of sprinkles to the bath bomb mixture. Totally optional.

Step 16: Add a bit of sprinkles to bath bomb.

Step 17: Add bath bomb mixture into both sides of mold. Be sure to overfill on each side.

Step 18: Firmly press molds together. Gently tap top and sides of mold and release bath bomb. Allow to dry overnight.

If your idea of Halloween fun includes a little bubbling, fizzing magic—without the sugar crash—these DIY Halloween Bath Bombs are your new favorite trick and treat. Think spooky swirls, candy-free gifts, and a little self-care potion-making, all rolled into one bewitching bath-time delight.

These are perfect for mums who’d rather stir up a bath bomb cauldron than bake another round of cupcakes for the class party. They also make fang-tastic gifts for teens, neighbours, or anyone who needs a little seasonal sparkle in their soak.

Why You’ll Love These Spooky Bath Bombs

Kid-safe ingredients – No creepy chemicals here
Great for gifting – Pop into mini cauldrons, treat bags, or mason jars
Smells like fall – Think pumpkin spice, candy corn, or sweet orange
Budget-friendly – Uses pantry staples and affordable citric acid
Easy to customize – Add spiders, glitter, glow-in-the-dark mica, or even a surprise toy

Ingredients

1 cup baking soda
1/2 cup citric acid
1/2 cup cornstarch
1/2 cup Epsom salt or fine sea salt
2 tsp sweet almond oil (or coconut oil)
1 tsp water or witch hazel in a spray bottle
10–15 drops essential oil (sweet orange, lavender, cinnamon, or candy-like blends)
Natural colorants or skin-safe mica powder (orange, purple, black, green)
Optional: eco glitter, mini plastic spiders or Halloween charms
Silicone molds or mini plastic cauldrons

How to Make Halloween Bath Bombs

1. Mix the Dry Ingredients

In a large mixing bowl, combine baking soda, citric acid, cornstarch, and Epsom salt. Whisk until it’s smooth and uniform—like a dusty spellbook.

2. Blend the Wet Ingredients

In a small bowl, mix your carrier oil and essential oils. Add your chosen colorant and glitter here too. If using black, go light—it can stain tubs if overdone.

3. Combine with Care

Slowly drizzle the wet mixture into the dry mix, whisking continuously. It should feel like damp sand. If it clumps when squeezed, you’re ready. Mist lightly with water or witch hazel if too dry.

4. Add Hidden Surprises

Press a small plastic spider, glow cube, or toy into the center for a trick-or-treat effect!

5. Mold It Up

Spoon the mixture into your molds, pressing firmly. Let them dry at least 24 hours before popping out.

Spooky Variations to Try

Spider Surprise

Hide a plastic spider inside and use black mica for a creepy crawl effect.

Pumpkin Spice Delight

Add a dash of cinnamon and orange essential oil with orange coloring.

Glow-in-the-Dark Witch Bombs

Use glow mica and store under light for a fun bathroom glow!

Boo Bombs for Kids

Make ghost-shaped fizzies using a silicone mold and sweet vanilla oil.

Packaging Ideas for Gifting

Wrap in cellophane with twine and a tag: “Drop in warm water and summon a spooky soak!”
Nestle in mini cauldrons from the dollar store
Use kraft boxes lined with Halloween tissue paper for classy spooky gifting
Add a punny printable tag like “You’re the bomb!” or “Witch, please!”

Tips & Tricks

Don’t over-wet your mixture—it can fizz prematurely.
Use gloves to avoid stained fingers.
Let kids help with colors and pressing (just maybe keep the glitter far away unless it’s a full moon).

Why These Are Better Than Candy

Let’s be honest—October sugar overload is real. These bath bombs are a charming alternative that still feel like a treat. Plus, they turn your bathroom into a spa and a mad scientist lab.

Whether you’re making them for your kids’ school party, teen Halloween sleepovers, or your own pumpkin-scented peace and quiet after bedtime chaos, these DIY bath bombs are a crafty way to keep Halloween fun—and fizzy.

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