Birch leaf

To capture birch leaf essence, growers harvest young leaves in early summer when oil content peaks. Workers transport the foliage to a nearby distillery and spread it in shallow copper vats. They apply steam at 100 °C for 45 minutes, allowing volatile molecules to rise with the vapor. The steam passes through a condenser where it cools, and the liquid condensate separates into birch leaf hydrosol and essential oil. The oil, a pale green liquid, contains 1‑hexanol, camphor, and birch aldehydes. After collection, technicians filter the oil through fine mesh, then store it in amber glass bottles to protect it from light. The entire process yields roughly 0.3 % oil by weight, a modest return that reflects the delicate nature of the leaf. For birch tar oil, producers use destructive distillation: they load seasoned birch wood into a sealed retort, heat it slowly to 400 °C, and collect the tar that drips from the heated mass. The tar is then refined, but the leaf oil remains the primary source for the birch leaf note in perfumery.