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Glossary

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Oil:

any of a large class of substances typically greasy, viscous, combustible, liquid at ordinary temperature, soluble in ether or alcohol, but not in water. Refined or crude petroleum.

Oleic acid:

a colorless, odorless, liquid monounsaturated fatty acid used in soap making to offer soft, conditioning properties.

Oleo gum resin:

a natural exudation from trees and plants that consists mainly of essential oil, gum, and resin.

Oleoresin:

a natural resinous exudation from plants, or an aromatic liquid preparation, extracted from botanical matter using solvents. They consist almost entirely of a mixture of essential oil and resin.

Olfaction:

the sense of smell.

Oxidation:

in soap making, when available atoms in oils or fats exposed to air to react with oxygen, forming less stable compounds and initiating the process of rancidity.