Pyroligneous acid, also called wood vinegar or mokusaku, is a dark liquid produced by the destructive distillation of wood. Its principle components are acetic acid and methanol. It was once used as a commercial source for acetic acid.
Recently, it has been been promoted as a natural aid for various uses including detoxification, mild pain relief, and to sterilize and promote healing of minor wounds. These claims may be of questionable value.