Direct Black 49
Name:C.I.Direct Black 49,C.I.34155
Molecular Structure: trisazo class
C.I.Direct Black 49,C.I.34155,CAS 6473-15-0,873.71,C37H22N7Na3O11S2
Molecular Formula:C37H22N7Na3O11S2
Molecular Weight: 873.71
CAS Registry Number:6473-15-0
Manufacturing Methods : 5-Amino-2-hydroxybenzoic acid diazo, and Naphthalen-1-amine coupling, again diazo, in alkaline conditions and 6-Amino-4-hydroxynaphthalene-2-sulfonic acid coupling, product to diazo, in alkaline conditions and 7-Amino-4-hydroxynaphthalene-2-sulfonic acid coupling.
Properties and Applications: blue gray. Soluble in water for blue purple. In the dark for the strong sulfuric acid, after diluted blue-ray black precipitation. The dye solution to join strong hydrochloric acid blue precipitation; Add thick sodium hydroxide solution to blue.
| Standard | Acid Resistance | Alkali Resistance | Light Fastness | Soaping | Water | ||
| Fading | Stain | Fading | Stain | ||||
| ISO | 3 | 4 | 3 | 2 | 2-3 | ||
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