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Direct Black 71

Name:C.I.Direct Black 71,C.I.25040

Molecular Structure: Double azo,Copper complexes

Molecular Formula:

Molecular Weight:

CAS Registry Number:1325-32-2

Manufacturing Methods : 2-Methoxy-4-nitrobenzenamine diazo, and 4-(8-Hydroxy-6-sulfonaphthalen-2-ylamino)benzoic acid coupling, then use glucose and sodium hydroxide reduction, reoccupy ammonia containing copper sulfate solution of processing.

Properties and Applications: blue ash. Soluble in water for dark to gray, not soluble in alcohol. In the dark for the strong sulfuric acid, diluted Gray light purple for a precipitation. Dye with strong hydrochloric acid solution for violet black, precipitation; Add thick sodium hydroxide solution as dark blue, precipitation.

Standard Acid Resistance Alkali Resistance Light Fastness Soaping Water
Fading Stain Fading Stain
ISO 3 5 6 2-3 2-3
AATCC 3 4 6 2-3 4

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