Homemade Castille Soap DIY Recipe

Lavender Homemade castille Soap 300x300Traditionally the term Castille, in regard to soap, referred to a hard white soap made from olive oil. It was named for the Castille region of Spain where they made soap only using olive oil. Pure castille soaps are genuine soaps – as opposed to the complex blend of detergents that we generally regard to be liquid soaps which often, in fact, don’t contain any soap whatsoever! Bathing is one of the most enjoyable activities of the day. The soap you use when your shower not only affects your skin, it also affects your mood. Lavender soap is made from the aromatic lavender herb, a herb that is popular for its numerous health benefits. Sometimes soaps may also contain crushed lavender blossoms. A member of the mint family, it is a safe herb to use for the entire family, and its benefits are rewarding and substantial. The fresh, floral scent of lavender has a calming effect on the body and can even be used to treat stress, depression and anxiety. In addition, lavender oil helps to treat acne and other skin infections. There’s all the reason to use organic lavender soap in your bath.


  • 24 oz weight (680 grams) olive oil
  • 16 oz weight (454 grams) coconut oil
  • 30-40 Ml Of Essential Oils of your choice
  • 9.35 oz weight (265 grams) Potassium hydroxide lye flakes
  • 32 oz (4 cups | 907 grams) distilled water, for lye-solution
  • 10 to 12 cups distilled water, to dilute, plus extra as needed

Essential Oil Options

Insomnia/Relaxing/Calming/Anxiety - Lavender Oil or Frankincense or Rose

Skin Issues - Sandlewood Oil & 5 Tbsp of Turmeric or Tea tree oil or Neem

You can really customize the recipe by adding the essential oils you like and quantity as you please if its a little to much or not enough.

Instructions - Make the Soap Paste

  1. Add the olive oil and coconut oil to a large, (6 quart minimum) crock pot. Turn the crock-pot on high.
  2. While the oils are warming, put on your safety gloves and goggles, and carefully measure the potassium hydroxide lye into a stainless steel or pyrex bowl.
  3. Measure the water into a medium stainless bowl or pyrex pitcher. Set the container with the water into your sink, then very carefully tip the lye flakes into the water. Stir to dissolve.
  4. When the oils in the crockpot are warm, carefully tip the lye solution into the oils. Leave the crockpot on high.
  5. Use an immersion blender to blend the oils and lye solution together. Immediately after adding the lye solution to the oils, blend for about 5 minutes, until the mixture looks uniformly opaque and begins to slightly thicken. For the next 30 minutes, come back and blend the soap paste about every 5 minutes. The mixture will get thicker and thicker, progressing through an icing texture to something like Elmer's glue.

Cook The Soap Paste

When the soap mixture becomes too thick to blend with an immersion blender, lid the crock pot and cook the soap mixture for 3 hours on high.

Every 30 minutes or so, come back and fold and stir the soap paste with a heat-resistant silicone spatula or heavy wood spoon to ensure the soap paste cooks evenly.

As the soap cooks, it will become increasingly translucent, moving from a runny white liquid to a puffy taffy texture to, eventually, a yellowy-clear, thick, translucent gel.

Can be used as a homemade shampoo or a homemade soap recipe or a homemade castille soap recipe as well.

Test Soap Clarity

  1.  After 3 hours, or once the paste looks fully translucent and gelled throughout, check the soap with a clarity test.
  2. Measure out an ounce of soap paste (about a golf-ball sized blob will do it). Add 4 oz (1/2 cup) of boiling or very hot water to the soap paste. Stir gently until the soap paste is totally dissolved.
  3. Allow the dilute soap to cool. If the soap is opaque, or if a scum of oils floats to the surface, continue cooking your soap paste for another hour before re-testing.
  4. If the dilute soap is clear (it needn't be colorless, just translucent), proceed with dilution.

Dilute the Soap Paste

  1.  Add 10 cups water to the soap paste in the crockpot. Break up the soap paste into the water as best you can but don't worry about the paste dissolving fully.
  2. Lid the crock pot and turn the heat to warm for 8 hours or overnight. If you happen to walk by, give the soap a stir to help it along but don't worry if you can't.
  3. After 8 hours, if you notice chunks of remaining soap or thick skin of soap forming even after the chunks of soap dissolve, add another cup or two of water to further dilute the paste.

Bottle Soap

  1. When your soap is fully dissolved with no chunks of soap paste remaining, ladle your dilute soap into a perfectly clean and dry 1-gallon glass or plastic jug.


Full Credit goes to Erica, awesome article

How To Make DIY Liquid Castile Soap 

February 17, 2016 by Erica


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