How To Make Olive Oil Soap

Olive oil soap, also known as Castile soap, is one of the oldest luxury soaps made by man.  It is most sought after for its moisturizing effect on the skin, which leaves it soft and smooth. It’s also one of the more expensive soap in part because of the cost of the main ingredient, which is olive oil.

If you love olive oil soap, you can now make this yourself by following this simple recipe on how to make olive oil soap.



1.5 liters olive oil
200 ml lye
590 ml cold distilled water



rubber or wooden mold with a lid
stainless steel or enamel pot
Pyrex container
rubber spatula



Preparing the Lye Solution:

  1. Mix together the lye and the cold water in a pyrex container, making sure to gently pour the lye to the water and not the other way around.

  2. Stir gently using the rubber spatula until the lye has completely dissolved in water.

  3. The solution that you produce will be hot - around 150F to 200F and it will produce fumes - so make sure you do this in a well ventilated area.

  4. Put the container in a cold water bath while preparing the other ingredients to bring the temperature down to about 100F.


Preparing the Oil

  1. Put 52 oz. of olive oil in a stainless steel pot and set this on top of the stove.

  2. Allow to warm on medium heat while gently stirring it. Bring it to 100F.

  3. Remove from the stove.


Creating the Soap

  1. When the temperature of the lye solution has reached 100F, gently add this solution to the olive oil.

  2.  Stir the solution until you achieve trace. When mixing by hand, this could take about an hour of stirring. Some soap makers will recommend the careful use of stick blenders to speed up the process. You know you’ve reached trace when you begin to see visible drops of soap on top of the mixture that takes a while to incorporate back into the mixture.

  3. Pour the mixture into your mold. Fasten the lid.

  4. Wrap the mold in warm towel and set aside to cool.

  5. Leave the mold undisturbed for at least 12 hours and then check for moisture. You may observe some liquid on top of the soap. You can leave it without doing anything and in most cases, it is reabsorbed back into the soap.

  6. After 48 hours, remove the towel, and continue to allow the soap to harden.

  7. After a few more days, the soap should be dry enough that it would easily separate from the mold. Once you’ve removed it from the mold, cut it into your preferred size.

  8. Once you’ve successfully removed them from the mold, you need to let the soap cure for 2 weeks to a month. By then, you’re sure that the olive oil soap is ready to be used.