Mauveine, also known as aniline purple and Perkin's mauve, is a synthetic organic compound that was the first aniline dye. Discovered in 1856 by chemist William Henry Perkin, mauveine was a revolutionary discovery in the field of chemistry, particularly in the development of synthetic dyes. Its vibrant purple color made it immensely popular in the textile industry and opened up new possibilities for various applications, including histology.