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Video: Rainbow Soap with Petal Technique

Rainbow Cake with Rainbow Petal Frosting
Rainbow Cake with Rainbow Petal Frosting

Over the weekend, I was playing around with a cake design technique that I’ve been wanting to translate to soap. I do this a lot with techniques – baking and soaping go hand in hand!

One of my little darlings turns four this week, so I made her birthday cake based on a multitude of YouTube tutorials. (My kidlets love watching Nerdy Nummies and I totally don’t mind!)

The inside of the cake is rainbow striped, while on the outside, I tried out the petal technique.

So, obviously, it was time to hit the soap studio to give my hand at this technique in soapmaking. Of course, I went to my standby: rainbow soap!

Surprisingly, it didn’t take as long as it did to decorate the cake!

I don’t have any slab molds right now (but that is changing!), so I used a Bramble Berry 10″ silicone loaf mold and just filled it to about an inch tall.

Rainbow Petal SoapYou’ll notice that I kept the bottles upside down inside some plastic containers. The raw soap is literally a heavy trace, so turning them back upright would result in a lot of banging the bottles around to get the soap to come out!

For this rainbow soap, I used the holy trinity soap formula since I had a masterbatch of it sitting around for colorant testing for the upcoming Swatch Mania v2. (50% Olive Oil, 25% Coconut Oil, 25% Palm Oil)

I also used micas and fragrance from Mad Oils, a new soap supply company started by three lovely ladies. The micas are: Bazooka Joe, Tangerine Dream, Bright Yellow Raincoat, The Maniacal Pea, Key West Blue, and Grape Nehi. The fragrance was their delicious Cotton Candy.

The Tangerine Dream mica morphed to a red orange while the soap was still raw, but changed back after saponification. I wasn’t too surprised by this, as it happens sometimes with other orange micas I have.

The Bazooka Joe mica, which is pink, faded a lot but I think it’s because I couldn’t get the soap to gel. I’ll probably up my usage rate next time to see what happens.

The fragrance smells delish, though! Out of bottle, it smells like the real deal. It mellowed a bit in soap, but seems to be perking back up as the soap gets older. Hurray!

Think you’ll give this technique a shot? Make sure to tell me about it!

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15 Responses

  1. It’s great. I was thinking about using the 9 bar slab mold from Bramble Berry. I am a little under the weather right not, so will hopefully try this next week sometime. I will let you know. Yours is so great, everything you make is great.
    Thanks so much,

    1. I bought a BB 9 bar slab mold from a friend, and it’s on it’s way to me. 🙂 So, I’ll be right there with ya next week! 🙂 Hope you feel better soon!

  2. It looks amazing! Loved watching your process, too! Looks like you need to have a slow moving recipe and a lot of patience to make those different colored petals. My kids and I love to watch Nerdy Nummies, too! 🙂

  3. Amazing! I would love to try this. I am thinking an Easter soap with all pastel colors! I love the idea of it smelling like cotton candy! I am checking out Mad Oils today! I hadn’t heard of this company yet…. I see my wallet getting much thinner…

  4. Beautiful soap Kenna! I definitely want to try this. I have a small 6″ square silicone mold which will work great for a first try. Thank you so much for posting the video. I was wondering how you did this technique. Much appreciated. 🙂

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