Direct Black 27
- Molecular Weight: 0
What is Direct Black 27?
Preparation
4-(4-Aminophenyl)benzenamine double nitriding, first and 4,5-Dihydroxynaphthalene-2,7-disulfonic acid coupling, and then in alkaline conditions and 6-Amino-4-hydroxynaphthalene-2-sulfonic acid?coupling, product to diazo, and Benzene-1,3-diamine coupling.
Properties and Applications
blue and black. Moderate soluble in water for hidden cyan, not soluble in alcohol. The strong sulfuric acid for Tracy in blue, diluted for dark purple. The dye solution to join strong hydrochloric acid have precipitation of dark; Add thick sodium hydroxide solution for purple.
| Standard | Acid Resistance | Alkali Resistance | Light Fastness | Soaping | Water | ||
| Fading | Stain | Fading | Stain | ||||
| ISO | 4 | 3 | 4 | 1-2 | 2-3 | ||
Safety information for Direct Black 27
New Products
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![4-Amino-3,6-bis[[4-[(2,4-diamino-5-methylphenyl)azo]phenyl]azo]-5-hydroxynaphthalene-2,7-disulfonic acid disodium salt](https://img.chemicalbook.in/CAS/GIF/6745-67-1.gif)
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![6-Amino-4-hydroxy-3-[[4-(phenylazo)-1-naphtyl]azo]-2-naphthalenesulfonic acid sodium salt](https://img.chemicalbook.in/CAS/GIF/6227-04-9.gif)
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![3,3'-[1,1'-Biphenyl-4,4'-diylbis(azo)]bis(6-amino-4-hydroxynaphthalene-2-sulfonic acid sodium) salt](https://img.chemicalbook.in/CAS/20180808/GIF/3626-23-1.gif)
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