Piece of indigo plant dye from India, c. 2.5 inches (6.35 cm) square.
Indigo dye is an organic compound with a distinctive blue color. Historically, indigo was a natural dye extracted from the leaves of certain plants (usually Indigofera tinctoria), and this process was important economically because blue dyes were once rare. A large percentage of indigo dye produced today – several thousand tons each year – is synthetic. It is the blue often associated with denim cloth and blue jeans.
Indigo in The War Between the Provinces[]
Indigo was an important industrial crop in the northern provinces of Detina, and an indirect casus belli of the Detinan Civil War.
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