Cold process soap made with 100% olive oil is known as “Castile” It is thought to originate in the Castile region of Spain – thus the name, Castile soap!
Olive oil is a staple soaping oil that can be found in many cold process recipes. Olive oil contributes moisturizing properties to soap. It also gives the bars a gentle and creamy (read: small, lotion-like) lather, making it a great choice for dry or sensitive skin.
Castile soap takes 4 - 6 months to cure. (Curing is a process that turns the natural ingredients, the oil and the water into a solid soap bar. )