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Indigo Blue is dark blue even grains vat dye,insolves in hot anilin,but not in water.It turns yellow green when meeting the oil of  vitriol.It is yellow in alkaline rongalite revert liquid and white in acidic liquid.Have good flowability, which is beneficial to the  automatic measuring and operation; good wettability and dispersibility, don't agglomerate or aggregate in use, and is  convenient for preparing dye liquor; good storage stability, and don't absorb moisture easily, and has not electrostatic  adsorption phenomenon.Widely used in dyeing cotton fabrics and Jeans and making up indigo bromide or made into organic  pigment ,moreover, be used to make 5.5-7.7-tetraroma indigo, biochemical medicament and indicator.