True Castile Soap is made with 100% Olive Oil, but very often you will find soap that is accepted as "Castille" because it has a very high proportion of Olive Oil.
Making 100% Olive Oil Soap/unscented Cold Processes Soap Making/White Buoy Soaps
Simple Secrets: Making Solid Castile Soap - Crafter's Choice
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Buy Totem Eco Australian Soap Genuine Castile Honey Myrtle 65g – Biome New Zealand Online
Castile Soap Recipe
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How to Make Castile Soap: Cold Process Olive Oil Soap Tutorial : Hearts Content Farmhouse
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Recipe Formulary - Cold Process & Liquid Soap - Cold Process Soap Recipes - Page 2 - Aussie Soap Supplies