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Aromatherapy is the use of pure essential and absolute oils. Essential oils are complex, highly
fragrant and volatile substances, with varying degrees of complexity, fragrance, and volatility.
They are the most potent and concentrated extracts of various parts of flowers, fruits, leaves,
spices, roots, and woods. The plant's essence molecules are approximately 75-100 times more
concentrated as an essential oil than in the dried plant.
The term "essential oil" is used somewhat loosely as it is often applied to all aromatic products such as essence oils, absolutes, resinoids, and concretes. In Aromatherapy, the most common method of extraction is steam distillation. However, cold expression is used for citrus oils, and a method of solvent extraction for absolutes, concretes and resinoids.