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Tutorial: Rainbow Spin Swirl Soap Recipe + Video

I’ve had a ton of requests for more rainbow soaps, so I decided to get started with a simple spin swirl soap! This technique is one of my favorites in a slab because it’s super easy and versatile. No matter if you are a beginner or an experienced soapmaker, you should be able to pull off this rainbow spin swirl soap!

Rainbow Spin Swirl Soap Recipe and Tutorial
Tutorial & Recipe: Rainbow Spin Swirl Cold Process Soap

I also decided to whip up a video, since that’s another huge request. I know I haven’t been as active on my YouTube channel, but I hope to change that! Let’s start with this spin swirl soap recipe:

This rainbow spin swirl soap recipe is sized for Brambleberry’s 18 Bar Slab Mold. (I use their silicone liner with my own mold box.) You can resize it using a lye calculator for whichever mold works for you. As requested, the formula includes percentages for your convenience in doing so!

(If you aren’t sure how much soap your mold holds, you can find out with this guide to resizing your soap recipes to fit your mold.)

Spin Swirl Soap Recipe Used

  • 20 ounces Coconut Oil (30% of the oils)
  • 14 ounces Apricot Kernel Oil (21% of the oils)
  • 11 ounces Olive Oil (16% of the oils)
  • 10 ounces Shea Butter (15% of the oils)
  • 9 ounces Avocado Oil (13% of the oils)
  • 3 ounces Castor Oil (5% of the oils)
  • 9.15 ounces Sodium Hydroxide (7% superfat)
  • 18.3 ounces Distilled Water (33% lye solution)

I bought these soapmaking oils from Soaper’s Choice, but you are welcome to buy them from your favorite supplier!

Don’t have one of these oils? Find out how to make an accurate substitution properly, and don’t forget to recalculate your recipe with a lye calculator!

Essential Oil Blend Used

  • 50 grams Lavender Essential Oil (45% of the blend)
  • 30 grams Peppermint Essential Oil (28% of the blend)
  • 20 grams Ho Wood Essential Oil (18% of the blend)
  • 10 grams Rosemary Essential Oil (9% of the blend)

These essential oils are from Liberty Natural, but you can use any fragrances or essential oils your heart desires.

You could also check out the essential oil calculator to find a different blend to suit your fancy!

Cosmetic Micas Used

  • 1 teaspoon Voodoo Pink Mica (Mad Oils)
  • 1 teaspoon Tangerine Dream Mica (Mad Oils)
  • 1 teaspoon Bright Yellow Raincoat Mica (Mad Oils)
  • 1 teaspoon Maniacal Pea Mica (Mad Oils)
  • 1 teaspoon Key West Blue Mica (Mad Oils)
  • 1 teaspoon Grape Nehi Mica (Mad Oils)

PREP WORK: Before diving in, make sure you have all of your ingredients prepped! I measured each cosmetic mica into its own container and predispersed the micas into a tablespoon of oil using my frother.

I also weighed and measured my oils and essential oils in my main soaping bucket, as well as mixing up my lye solution separately. This tutorial requires a lazy susan, I snagged one of these turntables from Amazon as they’re meant for televisions and such.


This rainbow spin swirl soap recipe featured in this tutorial is a cold process general purpose soap recipe. It is palm-free and vegan friendly! It uses a 7% superfat and a 33% lye solution. Feel free to adjust as necessary!

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21 Responses

  1. This is beautiful! I like the recipe a lot. I’m assuming that this is a slow-moving recipe; please confirm. Approx. how long do you usually have to work with the batter until it is too thick? Once I have your answers I am going to make something similar — thanks so much!

    1. Hi Kim! Yes, it’s a pretty slow recipe – not castile soap slow, but slow enough. 🙂 Just be careful not to overmix!

      I’d love to be able to give you an exact time, but it really depends on your individual situation – how long you mix, what stick blender you use, where you get your oils, etc., etc. More info about all that can be found here: http://www.modernsoapmaking.com/controlling-trace-in-cold-process-soapmaking/

      If it helps at all, the full original video of creating the soap lasted about 15 minutes.

  2. Judt did this! And here is the alchemy of soapmaking….didn’t have anough apricot oil, so subbed almond oil..no biggie. Wanted to use my new “day of the dead” fragrance oil from Nurture Soap, supposedly does not accelerate…well, it did. Also filled the containers too much, so didn’t have enough for blue left…duh. (note to self, not so exuberant next time)
    End reslut still came out beautiful. Now to see what it looks like tomorrow.
    “Rainbowish” swirlish”….lol, gotta love it.
    Thanks Kenna, hope you and your family have a wonderful christmas!

    1. Perfect substitution with the almond oil for apricot kernel oil! Shame on the fragrance though!

      Love that it still came out beautiful! Just goes to show it’s probably the most perfect rainbow soap recipe for anyone! 🙂

      Thank you for the holiday wishes, I hope you & yours had a fab Christmas as well!

    1. There’s so many to choose from! My old standby is definitely Energy, but to be honest, I was kind of tired of using the same FO in all my rainbow soaps!

      “Here, have some rainbow soap!”
      “Ohhhhh, what’s the scent?!”
      “Ummm, the same it always is…”

      Haha 🙂

  3. Hi. This is so pretty! My daughter and I are brand new to soap making but really want to try this with a real fruity scent and give as Christmas gifts. Any ideas for which fragrances/essential oils we should use to create the fruity smell? Thanks for the tutorial!

  4. This soap is gorgeous! I have a question, what causes the little white specs in the soap? Is it shea butter? I’m asking because I often have them show up in excess in my soaps (I use both shea & cocoa butters so wondering if that is the source!) As I’m practicing my soapmaking, I want to get a really smooth final product… Any suggestions on how to achieve this? Add silk powder, for example?

    1. Hey, Pix,
      Dig out one of the specks and take a closer look. Try to smash it.

      If it smashed easily, it is likely an air bubble. You need to make sure you are burping your stick blender, or it might be time to invest in a new one.

      If it doesn’t smash, it is likely a stearic spot, meaning a bit of stearic acid from your fat mix has solidified rather than turning into soap. (With the butters you mention, this is very possible.) You might need to up the temp of your oils a bit. Make sure they are fully melted before you start soaping.

      It is hard to diagnosis sight unseen, but that is where I would start. Solving either or both of those issues will result in a smoother soap.

  5. Hello, I am a beginner in soap making and wanted to know if adding starch powder in a soap is really useful to keep the smell of the fragrance. I’ve heard that before and wondered what you thought about it. thank you

  6. What does this smell like? Is there any way I can sub out ingredients to make this a fragrance soap? How can I get this to smell like pineapple?

    1. Sarah,
      Take a look at the blend of essential oils used to get an idea of the scent of the soap. You can, of course, swap our scent blend for one of your choice, including a soap-safe pineapple fragrance oil. Keep in mind that a fragrance that speeds trace may not leave you enough time to achieve this pattern.

  7. Just making now….using a REINFORCED cornflake box. I don’t have a mold as big as the one in the video. WISH me luck! Lol…but im SO excited to see it!!!❤️

  8. I cant find instructions on how long to cure? I made it November 1st and its still mushy?? Today is November 5th. I can put a finger indention in it?? Anybody know?

    1. Cure time depends on your environment – temp, humidity, if you run a dehumidifier, etc. A couple to several weeks for full cure isn’t unusual. But, mushy to the point of not being able to cut within 24 hours is unusual, Davy.

      I’d review your batch record to be sure everything made it in the pot, make sure your scale has been calibrated recently, and be sure your ingredients are in date and not exposed to moisture.

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