Pyroligneous acid, also called wood vinegar, is a dark liquid produced by the destructive distillation of wood. Its principal components are acetic acid and methanol. It was once used as a commercial source for acetic acid.

Recently, it has 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.

During the United States Civil War, cooks in the Confederate States of America tried to make up for an increasing deficiency in salt by preserving meat and fish in pyroligneous acid, which was not very effective (Kurlansky 2002, p. 267-68).

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de:Holzessig id:Cuka kayu pl:Ocet drzewny pt:Ácido pirolenhoso

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