An oleo-resin is obtained from blister-like swellings in the bark. It is harvested in the summer and used fresh, dried or distilled for oil. The resin extracted from it is used in perfumery, medicine and for caulking ships. Resin is tapped from trees about 60 - 80 years old in the spring and used for the distillation of oil. An essential oil obtained from the leaves is used as a disinfectant and also in medicine and perfumery.