how to make Castile soap

Castile soap has existed for centuries. It is as popular in Spain as Marseille soap in France. Back then, the soap was made from animal grease. Now, the ‘Castille’ region produces its soaps from 100% olive oil. With little foam and with its soft properties, Castile soap was very quickly adopted and reserved for the elite, notably for the Spanish royal family

In order to make Castile soap at the comfort of your home, follow this recipe.



  • 570ml olive oil
  • 75ml coconut oil
  • 75ml palm oil
  • 230ml cold water
  • 90g sodium hydroxide
  • 5 to 10 drops essential oils of your choice
  • Steel tray, a mold (silicon for cake), measuring container, silicon spatula, rubber gloves, safety glasses, a scale, a hand mixer, a big pan, apron, 2 cooking thermometers



  1. Prepare the ingredients and measure them precisely
  2. Put on the safety glasses, apron and gloves
  3. Pour water into measuring container
  4. Add SLOWLY the sodium hydroxide
  5. Mix with spatula until sodium hydroxide dissolves. The water will heat, leave it until it is cold again
  6. In the big pan, slowly melt all the oils (don’t include the essential oils yet)
  7. Place 1 thermometer in the sodium hydroxide and water mixture and 1 thermometer in the oil mixture
  8. Wait until both mixtures reach a temperature of 43ºC
  9. VERY SLOWLY mix the sodium hydroxide and water mixture in the oils
  10. Add a few drops of your chosen essential oils
  11. Now use the hand mixer to carefully mix the contents for a few minutes. First, very slowly without turning on the hand mixer. Then, turn it on for bursts of 3 seconds.
    Between each burst, slowly mix the mixture until it lightly thickens and resembles thickened cream.
  12. Pour the mixture in the mold and smoothen out with silicon spatula
  13. Place a cardboard piece over the mold and wrap an old towel around the mold to help contain the heat
  14. Leave your soap for 24 hours until hard
  15. When hard remove the mold and leave the soap in the open air for 1 to 2 days
  16. While keeping your gloves on, cut the soap in pieces since the soap will remain caustic for the first 48 hours
  17. Dispose the soap on the steel tray and covered it with a cloth. The soap should not touch each other so air is able to circulate
  18. Conserve the soap in dry place turning them over every day for the first week. Then, every two days for 3 to 4 weeks until use

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