Property and usage
It is a kind of blue powder of 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 either, but soluble in melt benzoyl oxide. It si 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
Strength, %:equal to 100 percent of standard sample
Content, %≥94.0, 96.0
Moisture content, %≤1.0
Degree of finesse（passing through the 60#screen mesh), %≥95
PH value7
