indigo blue

Property and usage

It is a kind of bleu powder reducing dye, and is the initial product of indigo. It is produced by stoving the filter cake from the former section. It is insoluble in water, ethanol and ethyl ether, but soluble inmelt benzoyl oxide. Itis mainly used in the dyeing and printing of cotton fiber, and is the special dye for jean fabric. It can also be processed into food dye and biochemical agent.

Quality index

Appearance	Homogenic dark blue powder
Color light	similar as the standard sample
Content,%	≥ 94.0% ,96.0%
Moisture content,%	≤ 1.0%
Strength,%	equal to 100 percent of standard sample
PH value	7
Content of ferric ions, ppm	≤ 200PPM

Property and usage

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

Quality index

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

Used:
Used for dyeing and printing on cotton fabrics.
excellent fastness properties, especially high fastness to sunlight, high fastness to perspiration, and high fastness to washing and bleaching.
military uniform and clothes
hospital uniform and clothes

Discharge Printing:
Also used as pigment to make printing paste. some of the products are used for cosmetics