The granular indigo is processed by spray drying the slurry of acid washing indigo with additive, it has advantages of: Free of dust or little flying dust. The granules have certain mechanical strength, and don' t create dust easily, so it can improve the working environment and sanitary condition. 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. It can also ensure the homogenic color and brilliant color light in printing and dyeing.

Appearance	Homogenic dark blue granules
Color light	similar as the standard sample
Content	≥ 93.0%、94.0%
Content	≤ 1.0%
Strength	equal to 100 percent of standard sample
pH value	8－9
Content of ferric ions, ppm	≤ 300PPM