Seirogan ingredient. That ingredient in the West may otherwise go by such names as "wood creosote", "beechwood creosote", or "liquid pitch oil", and should be distinguished from industrial "coal-tar creosote". To emphasize the distinction, wood creosote in Japan is sometimes called by such names as and minor variants thereof. The wood creosote is blended with two or more recognized in for their antiseptic and other effects, but the additional ingredients used are different among manufacturers (See under #Chemical composition for a sampling of formulas). Some quarters (perhaps kanpō medicine practitioners and others) insist however that "Seirogan is not strictly speaking kanpō
Birch tar Birch tar Birch tar or birch pitch is a substance (liquid when heated) derived from the dry distillation of the bark of the birch tree. It is composed of phenols such as guaiacol, cresol, xylenol and creosol. Birch tar was used widely as an adhesive as early as the Middle Paleolithic to early Mesolithic era. Neanderthals produced tar through the dry distillation of birch bark as early as 200,000 years ago. It has also been used as a disinfectant, in leather dressing, and in medicine. 5,000-year-old chewing gum made from birch bark tar, with tooth imprints, has been found in