Blue, is mainly used to extract from the blue grass of indigo dye.
shrub of West Indies and South America that is a source of indigo dye.
The synthesis of aniline was used to make mauveine (aniline purple) dye and the synthesis of quinine was used to make indigo dye.
The indigo dye waste water is used traditional methods to achieve the ideal processing effect with so many difficulties that industry is always puzzled by the indigo waste water treatment.
