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Aniline is an aromatic benzeneamine substance that was first isolated in 1826 with the destructive distillation of indigo. It received this name because the plant from which it was obtained was called Indigofera anil. It is usually used commercially because it is cheap and can be used in the manufacture of different types of dyes. When prepared, it appears as a colorless, oily liquid that darkens easily when exposed to light. Furthermore, it is toxic and has an odor similar to rotten fish, as it belongs to the amine group. For these characteristics, her name is used as a synonym for dye.