Anilic Acid (Spanish anil, indigo), an acid produced by the action of diluted nitric acid upon indigo; also called indigotic acid. 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. Their composition is represented by the formula C7H6(NO2)03, H2O. Anilic acid decomposes acetate of lead, forming with the lead a crystallized anilate.