Single Oil Soap – Castor Oil – Day 1 8

Yesterday I talked a little about Castor Oil. As I haven’t yet featured Castor Oil as a single oil soap, I thought we could fix that today. Are you ready to learn what castor oil contributes to you soap? Let’s head to the kitchen and find out!I had a little whoops when making the Single Castor Oil soap. I heated the castor oil in the microwave for two minutes. I stirred my lye into my water and without letting either cool, I mixed them together. A separate test told me my castor oil would have been about 200° F and my lye solution about 170° F. I had a volcano in my mixing beaker! I was to busy jump back to get any decent photos of the action but it sure made a mess!What was really amazing to me is that the soap was so hot it started to gel on the counter! I have never seen a soap do that. I certainly relearned the importance of checking your temperatures! I also learned that 5 minutes of letting things cool is much better than 15 minutes of cleaning up hot soap! Egads! I think I forgot my brain today!

Needed Materials

Castor Oil
Microwave Safe Container
Immersion Blender


Recipe in Grams
454 grams Castor Oil
55 grams Lye
177 mL Water
Recipe in Ounces
16 oz Castor Oil
1.93 oz Lye
6 oz Water
Recipe in Percentages
100% Castor Oil
Q.S. Lye
Q.S. Water

Weigh the Castor Oil into a microwave safe container. Heat until warm. This took about 2 minutes for me. Add the lye to the water to for a lye solution. Mix the oils and lye solution and blend until trace is achieved. Step back watch volcano. Scrape into a mold and allow to sit for 24 hours. Enjoy!



Soap Scraped into Mold

Weighed Oil

Adding Lye Solution

Mixing Oil and Lye Solution

Mixing Soap

Watching Volcano

Scraping Soap off of counter

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Rating: 5.0/5 (4 votes cast)
Single Oil Soap - Castor Oil - Day 1, 5.0 out of 5 based on 4 ratings

About Taylor

I'm a twenty something happy, animal loving, curious experimenter. I love reaching back into history and trying old recipes for cosmetics or foods. I'm constantly asking "Why?" My curiosity has me trying new things. I love taking walks with my dog as well as staying at home to cuddle with the dog and my cats. Some of my favorite scents include Hinoki Wood, Rose Garden, Jasmine and Gladiator.

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8 thoughts on “Single Oil Soap – Castor Oil – Day 1

  • Madea

    Cool! Love that volcano, but glad its not me cleaning up. lol. I tripped over my own feet once and tossed my newly made lotion all over the clean kitchen. I wonder how the soap feels when its finished. Please let us know. Are you going to remake this with the correct temputures?

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  • Judy

    Fun volcano! You’ve invented a new method – kitchen counter rebatch! 🙂

    BTW, you don’t have to heat oils that stay liquid at room temperature. Let your lye cool down to 100-120 and you’re good to go.

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    • Andee

      The finished soap had a creamy and smooth feel but there was not any lather. I hope this helps!

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  • Noela

    I am curious what your soap was like after curing? The properties of castor oil in a soap should have resulted in a soft bar with very high conditioning, bubbles and lather but low cleansing. Does it describe your end result after 4-6 weeks?

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    • Tina

      Not much later at all. It was a softer bar and felt more gummy and not really pleasant. It cleaned well enough but the texture of the soap was just not thrilling. It also contributed to a LOT of soap scum. Need to clean the shower? YEP!

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      • Margaret

        Do you have hard water by chance? That may have killed the bubbles and contributed to soap scum, along with the bar being really soft (so lots of it would come off the bar when you used it). I’m going to make a liquid soap with 100% castor oil.

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        • Tina


          We have a water softener because our area has hard water. My shower and tub get a deep cleaning after many weeks. No buildup of soap or hard water unless castor oil soaps are used. Then it just feels gunky.
          I don’t often use a cleaner for my shower (I use soap there daily, right?) and when I deep clean I use a steam machine without any additional products.

          I think castor oil is like liver, you love it or hate it but it has no fence sitters.


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