Dictionaries describe Castile as an
olive-oil-based hard soap made in a style similar to that originating in the Castile region of Spain.
Soapmakers "Lingo"
Originally, among soapmakers, "
Castile" soap was used to differentiate all-vegetable soap from soap made from animal fat such as tallow and lard.
Over time, we started to use "
Castile" to indicate 100% olive oil soap; vs. "
Bastille" to indicate a soap made with at least 70% olive oil plus other vegetable oils/fats/butters, i.e., no animal fat.
Examples of commercial Castile Soaps:
Dr. Bronner's Pure Castile Soap ~ NB: Olive Oil is not the primary oil but it is all vegetable, no animal fats.
Ingredients: Water, Organic Coconut Oil*, Potassium Hydroxide**, Organic Palm Kernel Oil*, Organic Olive Oil*, Mentha Arvensis, Organic Hemp Oil, Organic Jojoba Oil, Mentha Piperita, Citric Acid, Tocopherol
*CERTIFIED FAIR TRADE INGREDIENTS
**None remains after saponifying oils into soap & glycerin.
https://shop.drbronner.com/
Kirk's Coco Castile ~ Contains NO olive oil but took it to court and won the right to continue to call the soap "Castile".
Ingredients: Sodium Cocoate,Water, Glycerin, Sodium Chloride, Sodium Gluconate, Fragrance
https://www.kirksnatural.com/products/original-bar-soap/
Bottom line? Feel free to call your 72% olive oil plus 2 butters a Castile... unless you're talking to us, of course, then you should probably use the lingo.
HTH :bunny:
ETA: Lingo definition: The vocabulary or jargon of a particular subject or group of people.