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Indigo

Structural formula:

Molecular formula: C₁₆H₁₀O₂N₂
Molecular weight: 262.26

Use: as raw material, reduced indigo is mainly used in cotton yarn, cotton cloth, wool or silk. The pure product can be used to produce food dyes. And it can also be used to produce 5.5'-7.7'-tetrabromo indogo, and used in biochemical medicament and indicator.

Technical conditions: execute HG/T2750-1996
Apperance: dark blue uniform powder
Assay % (oxo process): =94
Fineness %(60mesh): =95
Water content %: =1.0
Iron ions: 300ppm