Avocado Cold Process Soap

Cold-process avocado soap with avocado oil and butter for a creamy, conditioning bar. Heat-transfer method — full lye math, percentages and step-by-step photos.

In this recipe
  1. Ingredients:
  2. Method:
  3. Related articles:

If you have never made soap before, I suggest starting with the soap for beginners recipe or the 100% coconut oil soap.

This recipe uses the heat transfer method, which is not recommended if it’s your first cold process soap. This method requires a bit of experience with soap making. If you made a few soaps before, you would know when you reach trace and when the batter is ready to be poured.

Remember to use eyes and hands protection while making soap.

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This recipe uses both avocado oil and avocado butter. The avocado oil will add conditioning properties to the soap and create a softer bar.

The avocado butter is high in fatty acids and contains antioxidants. It will add moisturizing properties to the soap.

Castor oil helps achieve a stable lather in the soap bar. It also boosts the bubbles and creaminess of the bar.

I added french green clay to have a light green color, and also, the clay gives a gentle exfoliation to the bar.

You can skip the clay if you don’t have green clay. You can swap it with white kaolin clay for the benefits of clays in soap, or you can use bentonite clay instead.

After unmolding the soaps from the molds, let them cure for 3-6 weeks before using them.

This recipe is for 7-8 cavities mold.

Ingredients:

  • Distilled water 150g
  • Sodium hydroxide (lye) 83.50g
  • Avocado butter 120g
  • Avocado oil 84g
  • Coconut oil 180g
  • Cocoa butter 60g
  • Sunflower oil 120g
  • Castor oil 36g
  • 1tbs french green clay (mixed with 3tbs of distilled water)
  • Essential oil Eucalyptus (optional) 18g

Method:

  1. In a stainless steel container (or plastic suitable for soap making), add the coconut oil, the avocado butter, and the cocoa butter.

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  1. Add the distilled water to a suitable container (high-quality plastic or stainless steel).

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  1. Add the sodium hydroxide (lye) to the water and mix to dissolve.

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  1. Add the liquid oils (sunflower oil, avocado oil, and castor oil) to a different container.

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  1. Pour the lye solution (sodium hydroxide+water) onto the hard oil and butters. This is called the heat transfer method. The hot lye solution will melt the hard oil and butters.

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  1. Mix the hard oil and butters with the lye solution.

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  1. Meanwhile, prepare the clay, add distilled water to hydrate the clay, mix to create a smooth texutre.

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  1. After some time, the hard oil and butters will melt, and this is the time to add the liquid oils.

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  1. Mix everything to combine. Use an immersion blender to reach a light trace.

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  1. Add the clay and mix to combine.

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  1. Add the essential oil and mix to combine.

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  1. Give another pulse or tow with the immersion blender to reach a medium trace.

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  1. Pour into silicone molds.

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  1. Wait 24-48 hours before unmolding the soaps. This recipe creates softer bars, so you might want to unmold them after 36-48 hours.

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  1. Let the soaps cure for 3-6 weeks before using them.

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Frequently asked questions

How long do these avocado soap bars need to cure?
Cure for 3 to 6 weeks after unmolding. Longer cure means a harder, longer-lasting and milder bar, so 6 weeks is ideal. Place bars on a rack with airflow on all sides while curing.
Can I skip the french green clay?
Yes, the clay is only for color and a light exfoliation. You can replace it with white kaolin or bentonite clay for the same amount, or skip entirely without adjusting other ingredients.
Is this recipe good for beginners?
No, this one uses the heat transfer method (hot lye melts the hard oils and butters), which needs a feel for trace. Start with the soap for beginners recipe or 100% coconut oil soap first.
Why is castor oil important here?
Castor oil at 36g (around 6% of oils) gives this soap a stable, creamy lather with good bubbles. Skip it and the lather will be flatter and shorter-lived, even though the bar will still wash well.
How long does the finished avocado soap last?
A properly cured cold process soap lasts 1 to 2 years if stored cool and dry with airflow. Keep it out of plastic bags during storage, since trapped moisture can encourage DOS (dreaded orange spots).