Indigo powder [ 482-89-3 ]

USES: as indigo dye reduction, mainly for the wool or cotton yarn, cotton, silk, tasted for making food dye, also can produce 5.5 '- 7.7' - tetrabromobisphenol indigo, and used in biochemical reagents and indicator etc.
Technical conditions: execution of the People's Republic of China professional standard employed by HG/T2750-1996

Appearance: dark blue uniform powder
Content % (oxidation) : p 94
Fineness % (through 60 mesh screen) : p 95
Moisture content % : more than 1.0
Iron ion: 300ppm