castile soap

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Related to Hard soap: soft soap
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  • noun

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a good hard soap made from olive oil and sodium hydroxide

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References in periodicals archive ?
If NaOH is used a hard soap is formed whereas when potassium hydroxide (KOH) is used, a soft soap is formed.
Ashes of burnt seaweed are particularly useful as these produce a sodium-based lye from which hard soap can be made.
95 each, except the hard soap which costs pounds 3.
The range, which includes bath and shower wash, face and body moisturisers, as well as an organic hard soap, is based on natural plant extracts and aromatherapy essential oils, and is priced at 3.
79 for 300ml Perfume: Just like the hard soap, clean and fresh-smelling.