One of the mysteries of the English language finally explained.
Fine, hard white or mottled soap made with olive oil and sodium hydroxide.
- ‘Often based on pure Castile soap, natural shampoos are usually combined with high-quality herbs and plant oils that leave your hair and scalp healthier.’
- ‘This produced what was probably the first white hard soap: Jabon de Castilla, or Castile soap, also known to pharmacists as Sapo hispaniensis or Sapo castilliensis.’
- ‘Because of its mildness, Castile soap became the soap of choice for babies and those with sensitive skin.’
- ‘Our soaps are made using a traditional Castile soap formula from the 19th century.’
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