Soap Craft Lab
Ingredients/Castor Oil
oils-butters5–10% of total oils

Ingredient Deep Dive

Castor Oil in Soap Making

Castor oil is a thick, sticky oil never used alone in soap but prized as a lather booster. Even a small amount (5–10%) dramatically stabilizes and enhances the bubble quality of any soap recipe.

Benefits

  • + Boosts and stabilizes lather dramatically
  • + Creates a creamier, more luxurious bubble texture
  • + Only 5–10% needed for noticeable effect
  • + Especially useful in shampoo bars

Potential Issues

Using more than 10% can make soap soft, sticky, or slow to cure. Castor oil can also accelerate trace slightly in some formulations.

Pairing Tips

Add at 5–8% to almost any recipe for better lather. Pair with coconut oil (bubbles) and olive oil or shea butter (conditioning). Essential in shampoo bar formulations.

Recipes Using Castor Oil

Creamy Shea Butter Soap Recipe

4–6 weeks cure

Palm-Free Soap Recipe

4–6 weeks cure

Lavender Essential Oil Soap

4–6 weeks cure

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