The term “essential oil” actually comes from the idea of “quintessential oil.” Aristotle believed that in addition to the four physical elements (fire, air, earth and water) there was a fifth element, quintessence. This was considered to be the “spirit” or life force of the plant.
Today, essential oils are extracted from plants via two primary methods, distillation, which has been used since ancient times, and expression or cold pressing, which is used to extract citrus essential oils.
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