The water that is obtained along with essential oil after plant materials are distilled. In distillation, plant materials are heated in water to release plant oils. The steam and vapor are channeled through a tube to a condensing coil, where they cool and return to liquid form. The essential oils float on top of the water. The hydrosol contains water-soluble plant constituents and trace amounts of essential oil. Hydrosols are sometimes used in aromatherapy together with the essential oils and may be spritzed in the air and on the face and body.
True hydrosols are produced by water or steam distillation of the flower or herb, and contain most of the hydrophilic (water soluble) molecules from the plant or flower material that did not distil into the essential oil. Also known as hydrolat, hydrolate, distillate water or floral water. More info
Also known as floral water or distillate water. It is the by-product of steam distillation and includes some of the water-soluable elements of the plant not included in essential oil. In addition, hydrosol has many of the same properties as the essential oil in lower concentrations.