Essential oil refers to the general name of volatile aromatic substances extracted from spice plants or fragrant secreting animals. Generally, essential oils are volatile aromatic substances extracted from flowers, leaves, roots, seeds, fruits, bark, resin, wood core and other parts of plants by steam distillation, cold pressing, fat absorption or solvent extraction. Essential oils are divided into diluted compound essential oils and undiluted unilateral essential oils, such as cactus seed oil. Essential oils are highly volatile and will volati ...
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