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Name：Direct biue 86

CAS NO：1330-38-7

Molecular formula：C₃₂H₁₄CuN₈Na₂O₆S₂

Molecular weight：780.16

Structural formula：

Chemical properties：Dark blue powder. Good water solubility, its aqueous solution is lake blue. It is yellowish-green in concentrated sulfuric acid, turns greenish-blue after dilution, and produces bluish-green precipitation. Only partially dissolved in concentrated nitric acid is yellowish-green; Insoluble in a concentrated base; Dissolved in ammonia, lake blue. Slightly sensitive to hard water.

Purpose：Mainly used for dyeing cotton, viscose fiber, also used for dyeing silk, leather, paper pulp.