Formic, acetic, propionic and butyric acid contribute to the aroma. Formic acid is about ten times stronger than acetic acid. Vapors of formic acid and acetic acid are the most commonly used. Deoxycholic acid is soluble in alcohol and acetic acid. Halogenated acetic acids are produced from acetic acid. Aromatic rings are acetylated by acetic anhydride. Organic or inorganic salts are produced from acetic acid. Ammonia may be conveniently deodorized by reacting it with either sodium bicarbonate or acetic acid. This was based on reacting paraformaldehyde and ammonium nitrate in acetic anhydride. Dicarboxylic acids are converted to the anhydrides upon treatment with acetic anhydride. Lead acetate can be made by boiling elemental lead in acetic acid and hydrogen peroxide. The vapour of acetic anhydride is harmful. Finally, the amine is acetylated with acetic anhydride. The product of the condensation of two molecules of acetic acid is acetic anhydride. Acetobacter is a genus of acetic acid bacteria.