This is called also indigotic acid, from being produced by the action of diluted nitric acid upon indigo. Carbonic acid is produced with it, and remains in solution, the anilic acid separating it in light yellowish-white prisms, which are fusible and volatile, and dissolve in 1,000 parts of water. Anilic acid decomposes acetate of lead, forming with the lead a crystallized anilate.