This neon marble swirl melt and pour soap twists hot pink and cosmic blue together with no white at all. You pour the two colors into a silicone pan, roll and tear the slab, then pour the leftover pink and blue over the top so everything blends into a bright marble. It reminds me of cotton candy.
As an Amazon Associate I earn from qualifying purchases. Some links in this post are affiliate links. They cost you nothing extra and help support Koala Soap.
Materials & Tools
Soap Base
- About 20 oz of shea butter melt and pour soap base (10 oz per color)
Color & Scent
- Neon Poppin Pink and Cosmic Blue mica from a Stardust mica set, also sold individually
- A citrus fragrance oil (I used Yuzu Cybilla)
Tools
- Silicone cake pan
- Square silicone soap mold (18–20 oz)
- Chopsticks for stirring and poking holes
- Soap cutter
- Spray bottle of 91% isopropyl alcohol
- Thermometer
- Pour cups
Fragrance Amount
Use up to 5 ml of fragrance oil per 16 oz (1 lb) of soap base. You can always use less if you like a lighter scent, but don’t go over 5 ml per 16 oz.
How to Make Neon Marble Swirl Soap
1. Color Two Cups
Melt 10 oz of shea butter in each cup and add fragrance once they’re in the 140s. Mix the neon micas with alcohol and stir very well. Neon blue can speckle if it isn’t fully dissolved.
2. Pour the First Layer
Pour part of the blue into the silicone pan. Temperature doesn’t matter much for this first layer. Spray with alcohol and let it develop a thick skin.
3. Add Layers Slowly
Once the first layer is set (mine were around 108–117°F), pour pink slowly around the outer edges so it doesn’t break through. Keep alternating, but save some of each color for the final pour.
4. Let It Set Completely
Shea butter base takes longer than clear, about an hour.
5. Roll and Tear
Peel the slab up and roll it thin, so it’s easier to tear. Use your thumb to grip and tear it into pieces, then press them into a lopsided ball that fits right in the mold.
6. Pour Over the Ball
Poke holes with a chopstick. A skewer doesn’t make big enough holes. Rewarm the saved pink and blue to about 146–150°F, spray with alcohol and pour into the holes. Massage the mold gently and keep spraying as air bubbles rise.
7. Unmold and Cut
After a few hours, unmold. Push the loaf all the way up and to one side of the cutter, then cut. I got three 1-inch bars and a smaller one.
Tips & What I Learned
- Stir neon micas very well. They can speckle.
- Pour layers on the edges. The skin is firmer there.
- Roll thin. Thick rolls are hard to tear.
- Use a chopstick for holes. They let the final pour fill the gaps.
- Expect a little purple. Pink and blue blend where they meet, and pouring hotter makes more purple.
Troubleshooting
Too much purple. The final pour was too hot. Aim for the 140s if you can.
There are air pockets. Poke more holes and massage the mold gently.
The colors speckled. Mix the mica with alcohol until it’s fully smooth.
FAQ
Do I need white soap for a marble swirl?
No. This version uses only two colors, and the leftovers are poured over the top.
Why is my soap slow to set?
Shea butter base takes longer to set than clear base.
More Marble Soap Ideas
- Twisted Marble Swirl Melt and Pour Soap
- Activated Charcoal Swirl Melt and Pour Soap
- Neon Confetti Melt and Pour Soap
- Too Hot Amber and Blue Melt and Pour Soap
- All my melt and pour soap tutorials on YouTube
If you make this, I’d love to see it! Tag me on Instagram or Pinterest, and subscribe on YouTube for new soap tutorials.
