Bay Leaf Oil or Bay Oil is distilled from the leaves of a middle-sized tree, Pimenta Racemosa, earlier known as Myrcia Acris. The leaves are distilled either with water or with steam. It is customary to add salt to the distillation water in order to increase the temperature and thus complete the distillation of oil more rapidly (compare Vetiver oil in Réunion, etc.).
Arctander, Steffen . Perfume and Flavor Materials of Natural Origin (p. 100).