Name:C.I.Direct Black 56,C.I.34170
Molecular Structure: trisazo class
C.I.Direct Black 56,C.I.34170,CAS 8003-57-4,877.77,C36H22N7Na3O10S3,Direct Black Grey RLN,Direct Grey RLN,Direct Fast Grey LBN
Molecular Formula:C36H22N7Na3O10S3
Molecular Weight: 877.77
CAS Registry Number:8003-57-4
Manufacturing Methods : aniline diazo, and 5-Aminonaphthalene-2-sulfonic acid and 8-Aminonaphthalene-2-sulfonic acid coupling, again diazo, and 5-Aminonaphthalene-2-sulfonic acid and 8-Aminonaphthalene-2-sulfonic acid coupling, product to diazo, in alkaline conditions and 6-Amino-4-hydroxynaphthalene-2-sulfonic acid coupling.
Mainly used for cotton, linen, silk, cellulose fiber fabrics such as glue the dyeing. Can also be used for leather, paper all the dyeing.
| Standard | Acid Resistance | Alkali Resistance | Light Fastness | Soaping | Water |
| Fading | Stain | Fading | Stain |
| ISO | 3 | 4 | 4-5 | 3 |
| 2 |
|
| AATCC | 3 | 5 | 5-6 | 3 |
| 4 |
|