Saponified olive oil
Saponification means to convert a fat into soap by treating it with an alkali.
- Saponified oil or fat is a lipid substance treated with sodium or patassium hydroxide to convert it into soap.
- The oils used in modern handmade soap are carefully chosen by the soap maker for the character they impart to the final soap. Coconut oil creates lots of glycerin, makes big bubbly lather, and is very stable. Olive oil has natural antioxidants and its soap makes a creamier lather. Tallow, or rendered beef fat, makes a white, stately bar that is firm and creates abundant lather. Many other oils can be used, each one for a specific reason
Source: EWG.org, https://www.ewg.org/skindeep/ingredient/705807/SAPONIFIED_OLEA_EUROPAEA_%28OLIVE%29_OIL/