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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