indigo powder

Indigo powderProperty and usage: It is a kind of blue powdery 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 in melt benzoyl oxide. It is mainly used in the dyeing and printing of cotton fiber, and is the special dye for jean cloth. It can also be processed into food dye and biochemical agent. Quality index as below: AppearanceHomogenic dark blue powderColour lightSimilar as the standard sampleContent≥ 94.0%Moisture content≤ 1.0%StrengthEqual to 100 percent of the standard sampleDegree of finenessPassing through the 60# screen mesh ≥ 95%PH value7