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Castile Soap Ingredients

by
author image Cynthia Myers
Cynthia Myers is the author of numerous novels and her nonfiction work has appeared in publications ranging from "Historic Traveler" to "Texas Highways" to "Medical Practice Management." She has a degree in economics from Sam Houston State University.
Castile Soap Ingredients
Castile soap is white and hard. Photo Credit Mapoula/iStock/Getty Images

Overview

Castile soap originated in Spain, though the name came to refer to any hard, white, olive-oil based soap. Castile is a mild, emollient soap that has been used for everything from bathing to washing hair and teeth and cleaning the house. Castile soaps are moisturizing and were considered a luxury item, favored by royalty. Unlike soaps made with animal fat, or tallow, true Castile soap is made with olive oil, which makes the soap very creamy. Originally, Castile soap was made with 100 percent olive oil. This produces a soap that is slow to lather, so variations were developed with up to 80 percent olive oil and other oils, such as coconut oil or palm oil, making up the other 20 percent.

Olive Oil

Any grade of olive oil may be used for soap, though some people prefer cold-pressed oil over oils extracted through chemical methods. Chemical extraction will not effect how the oil behaves in the soap, but some people prefer an organic product.

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Distilled Water

Soap makers use distilled water to avoid minerals and impurities in the water that discolor the soap.

Lye

Lye mixed with water and added to the oil causes saponification, a chemical reaction that yields soap. Lye, or sodium hydroxide, is highly corrosive and should be handled with care. Keep lye out of reach of children, and wear eye protection and protective clothing when handling it. Lye is sold at hardware stores as flakes or pellets, in a dry powder or as a liquid.

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References

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