Direct Black 19
- CAS NO.：6428-31-5
- Empirical Formula: C34H30N13NaO7S2
- Molecular Weight: 819.81
- MDL number: MFCD00137529
- EINECS: 229-208-1
- SAFETY DATA SHEET (SDS)
- Update Date: 2026-01-13 11:19:56
What is Direct Black 19?
Preparation
4-Nitrobenzenamine (2 Moore) diazo, one in acid conditions, a in alkaline conditions and 4-Amino-5-hydroxynaphthalene-2,7-disulfonic acid (1 Moore) coupling, and then will the nitro reduction, diazotization, again with Benzene-1,3-diamine (2 Moore) coupled.
Flammability and Explosibility
Non flammable
Properties and Applications
green and black. Black powder. Soluble in water for green light black, solubility of 100 g/L (80 ℃), slightly soluble in ethanol and acetone. The strong sulfuric acid in the green light for black, dilute red after black precipitation; In nitric acid to dark brown. Dyes and microstructure of sulfuric acid solution 10% red; Add thick sodium hydroxide solution for green light blue. Copper ions in dyeing color shade the green, iron ion a slight change in color. Used in viscose of dyeing and printing. In the cotton knitwear, blankets, flannelette, silk, viscose, silk that the fabric, wool/viscose fiber blend fabrics can be used. Can also be used in leather, paper and electrochemical aluminum color.
| Standard | Acid Resistance | Alkali Resistance | Light Fastness | Soaping | Water | ||
| Fading | Stain | Fading | Stain | ||||
| ISO | 4 | 3 | 3-4 | 2 | 2 | ||
| AATCC | 4-5 | 3 | 3 | 2-3 | 2 | ||
Properties of Direct Black 19
| Boiling point: | 1379℃[at 101 325 Pa] |
| Density | 1.49[at 20℃] |
| vapor pressure | 0Pa at 25℃ |
| Water Solubility | 22.67g/L at 20℃ |
| CAS DataBase Reference | 6428-31-5(CAS DataBase Reference) |
| EPA Substance Registry System | C.I. Direct Black 19, disodium salt (6428-31-5) |
Safety information for Direct Black 19
Computed Descriptors for Direct Black 19
Direct Black 19 manufacturer
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