DIY Liquid Soap in a Slow Cooker

Use your own slow cooker to make yourself some homemade liquid soap for your home.

| February 2018

  • Handmade liquid soap is similar to the soap you would buy in a store, except you can customize the colors and smells to fit your home.
    Photo by Pixabay/jackmac34
  • “DIY Artisanal Soaps” by Alicia Grosso guides you step-by-step through the home soapmaking process, from basic recipes to packaging and selling your creations.
    Photo by Stephanie Hannus

DIY Artisanal Soaps (Adams Media, 2016), by Alicia Grosso equips readers with everything they need to begin making their own beautiful soaps right at home. Grosso lists the main ingredients needed, plus recipes on how to personalize your soaps to be perfect for your home. In this excerpt, she gives her recipe for making liquid soap in a slow cooker.

For this recipe, use a 3 1/2-quart slow cooker. If you use too small a slow cooker for the batch, you increase the chances of overheating, overflowing, and the “volcano” action of the cooking soap. You can make liquid soap in a double boiler or with the oven hot-process techniques, too.

This recipe yields about 3 pounds of paste, which will dilute to about 6 pounds of liquid soap.


• 22 ounces coconut oil
• 4 ounces castor oil
• 1 ounce jojoba oil
• 16 ounces water
• 6 1/4 ounces potassium
• hydroxide
• Rubbing alcohol in small spray
• bottle to control bubbles


1. Set the slow cooker to high. Place the coconut oil, castor oil, and jojoba oil into the slow cooker. Cover to hold in heat. Melt the oils.

2. Place the water in a heatproof container and sprinkle the potassium hydroxide into the water. Stir until all the potassium hydroxide is dissolved. (This mixture won’t get as hot as the lye solutions for solid soap since you’re using more water.) Without waiting for it to cool, add the potassiumwater solution to the oils by pouring it in a thin stream, stirring constantly and carefully to fully combine the mixture.

3. Using an immersion blender, blend the mixture to trace. Keep the head of the blender fully immersed to avoid blending air into the soap batter.

3/17/2018 10:36:28 AM

Phenolphtalein is a reactive used to measure Ph. Change colour according to it. Potassium hydroxide is the chemical name of potash. It has a very high Ph.

3/15/2018 8:44:45 AM

Hmm. Phenolphthalein and potassium hydroxide. Let me look behind the flour. Do most of your readers know what these are, much less have them? You kind of lost me there.

3/15/2018 8:44:41 AM

Oh, phenolphthalein. I'll just grab that from behind the flour. ???? I'd never heard of it. The title and subtitle made it sound more basic and natural.

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