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Direct Black 19

Direct Black 19 Structure
Direct Black 19 structure
CAS No.
6428-31-5
Chemical Name:
Direct Black 19
Synonyms
Direct Black 19;Black G;C.I.35255;RIFAZOLBLACKGR;Kayarus Black G;Direct black RN;Sumilight Black G;Condires Black AN;Vicorect Black FB.;Benzo Fast Black G
CBNumber:
CB4875556
Molecular Formula:
C34H30N13NaO7S2
Molecular Weight:
819.81
MDL Number:
MFCD00137529
MOL File:
6428-31-5.mol
MSDS File:
SDS
Last updated:2026-08-28 09:47:35
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Direct Black 19 Properties

Boiling point 1379℃[at 101 325 Pa]
Density 1.49[at 20℃]
vapor pressure 0Pa at 25℃
Water Solubility 22.67g/L at 20℃
InChIKey BRZPIOXDFJITBK-FVFGOVLKSA-N
SMILES NC1=C(C(S(O)(=O)=O)=CC2=CC(S(O)(=O)=O)=C(/N=N/C3C=CC(/N=N/C4C=CC(N)=CC=4N)=CC=3)C(O)=C12)/N=N/C1C=CC(/N=N/C2C=CC(N)=CC=2N)=CC=1.[NaH]
LogP -1.5 at 20℃
CAS DataBase Reference 6428-31-5(CAS DataBase Reference)
FDA UNII B91N7SNH1C
EPA Substance Registry System C.I. Direct Black 19, disodium salt (6428-31-5)

SAFETY

Risk and Safety Statements

Symbol(GHS)  Exclamation Mark (GHS07)
GHS07
Signal word  Warning
Hazard statements  H315-H335-H319
Precautionary statements  P264-P280-P305+P351+P338-P337+P313P-P264-P280-P302+P352-P321-P332+P313-P362
TSCA  TSCA listed
Hazardous Substances Data 6428-31-5(Hazardous Substances Data)
REACH Registrations Active

Direct Black 19 price More Price(13)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich S12174 DIRECT BLACK 19 (C.I.35255) AldrichCPR 1 unit $197 2026-04-30 Buy
Sigma-Aldrich S12174 DIRECT BLACK 19 (C.I.35255) AldrichCPR 6428-31-5 250mg $179 2024-03-01 Buy
Biosynth FD44459 Direct Black 19 6428-31-5 250g $220 2026-06-04 Buy
Biosynth FD44459 Direct Black 19 6428-31-5 500g $335 2026-06-04 Buy
Biosynth FD44459 Direct Black 19 6428-31-5 1000g $550 2026-06-04 Buy
Product number Packaging Price Buy
S12174 1 unit $197 Buy
S12174 250mg $179 Buy
FD44459 250g $220 Buy
FD44459 500g $335 Buy
FD44459 1000g $550 Buy

Direct Black 19 Chemical Properties,Uses,Production

Uses

Direct Black 19 is one of the main black dye varieties. It is primarily used for dyeing and direct printing on cotton, viscose fibers, and blends of cotton, viscose fibers, and silk or wool fabrics. It mainly dyes black, while gray and black are commonly used for printing. It can also be blended with brown dyes to create various shades of coffee, etc., and is used in small quantities for color adjustment to broaden the color spectrum. When dyeing wool-viscose blended fabrics, it can be dyed in the same bath as Neutral Black BRL for uniform color. It can also be used in the same bath as disperse dyes to dye polyester-viscose blended fabrics. It has good dye uptake but slightly poor migration. After dyeing, it can be treated with fixing agents Y and M, but the color has a slightly greenish hue. Finishing with urea-formaldehyde resin can maintain the color and improve wet fastness.

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

Direct Black 19 Preparation Products And Raw materials

Raw materials

Sodium sulfide Sodium nitrite m-Phenylenediamine 4-Nitroaniline Sodium carbonate
8-Amino-1-naphthol-3,6-disulfonic acid monosodium salt monohydrate m-Phenylenediamine 4-Nitroaniline

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Preparation Products

Direct Black 19 Suppliers

Global( 154)Suppliers
Supplier Tel Email Country ProdList Advantage
Winchem Industrial Co. Ltd 0574-83851061 info@win-chemical.com China 500 55
Shanghai JONLN Reagent Co., Ltd. 400-0066400 13621662912 422131432@qq.com China 9970 55
Chengdu HuaXia Chemical Reagent Co. Ltd 400-1166-196 13458535857 cdhxsj@163.com China 13323 58
Hubei Jusheng Technology Co.,Ltd 027-59599241 18871490274 1400878000@qq.com China 9506 58
Alfa Chemistry 1-516-6625404 support@alfa-chemistry.com United States 9170 60
Shanghai YuanYe Biotechnology Co., Ltd. 15026964105 2881489226@qq.com China 89667 60
Shandong Xiya Chemical Co., Ltd. 4009903999 13395398332 sales@xiyashiji.com China 20788 60
Guangdong wengjiang Chemical Reagent Co., Ltd. 0751-2886750 13927877953 3005811397@qq.com China 13282 58
Shanghai Orgchem Co.,Ltd. +86-21-5877 1921 info@chemofchina.com China 9630 55
Rhawn Reagent 400-400-1332688 18019345275 huyue@rhawn.cn China 14942 58
Supplier Advantage
Winchem Industrial Co. Ltd 55
Shanghai JONLN Reagent Co., Ltd. 55
Chengdu HuaXia Chemical Reagent Co. Ltd 58
Hubei Jusheng Technology Co.,Ltd 58
Alfa Chemistry 60
Shanghai YuanYe Biotechnology Co., Ltd. 60
Shandong Xiya Chemical Co., Ltd. 60
Guangdong wengjiang Chemical Reagent Co., Ltd. 58
Shanghai Orgchem Co.,Ltd. 55
Rhawn Reagent 58

View Lastest Price from Direct Black 19 manufacturers

Image Update time Product Price Min. Order Purity Supply Ability Manufacturer
Direct Black 19 pictures 2026-09-11 Direct Black 19
6428-31-5
 25kg 1 5mt Winchem industrial co limited
Direct Black 19, DIrect Fast Black G pictures 2022-10-26 Direct Black 19, DIrect Fast Black G
6428-31-5
 $2.00 25kg 99% 20 tons TIANJIN XIANGRUI DYESTUFF CO.,LTD
Direct Black 19 pictures 2019-12-24 Direct Black 19
6428-31-5
 $1.00 1KG 98%HPLC 10t Career Henan Chemical Co

6428-31-5(Direct Black 19)Related Search:

DIRECT RED 80 Direct Black 168 Direct Orange S Direct Yellow 12 Direct Black 38
Iron Oxide Green CHLORAZOL VIOLET N BRILLIANT YELLOW Direct Red 31 DIRECT FAST BROWN M
CI NO 22610 Direct Red 23 DIRECT BLUE 15 Direct Blue 86 Direct Black 166
DIRECT BLACK 22 Stilbene yellow Diamine green B

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Direct black RN disodium 4-amino-3,6-bis[[4-[(2,4-diaminophenyl)azo]phenyl]azo]-5-hydroxynaphthalene-2,7-disulphonate Black G Atul Direct Black VG Benzo Fast Black G Condires Black AN Kayarus Black G Sumilight Black G Tertrodirect Viscose Black GTN Vicorect Black FB. 2,7-Naphthalenedisulfonic acid, 4-amino-3,6-bis4-(2,4-diaminophenyl)azophenylazo-5-hydroxy-, disodium salt RIFAZOLBLACKGR Direct black 19 (C.I. 35255) 1-Hydroxy-8-amino-2,7-bis[[4-[(2,4-diaminophenyl)azo]phenyl]azo]-3,6-naphthalenedisulfonic acid disodium salt 4-Amino-3,6-bis[[4-[(2,4-diaminophenyl)azo]phenyl]azo]-5-hydroxynaphthalene-2,7-disulfonic acid disodium salt C.I.35255 2,7-Naphthalenedisulfonic acid, 4-amino-3,6-bis[2-[4-[2-(2,4-d iaminophenyl)diazenyl]phenyl]diazenyl]-5 -hydroxy-, sodium salt (1:2) DIRECT BLACK 19 LIQUID Direct Black 19 ISO 9001：2015 REACH Direct Fast Black G (C.I. Direct Black 19) C.I.Direct Black 19:C.I.35255 Direct Black 19, DIrect Fast Black G 4-Amino-3,6-bis((4-((2,4-diaminophenyl)diazenyl)phenyl)diazenyl)-5-hydroxynaphthalene-2,7-disulfonic acid, sodium salt Direct Black 19 6428-31-5 C34H27N13Na2S2O7 C34H27Na2O7S2 C34H27N13Na2O7S2 C34H27N13O7S22Na Organics Dyes and Pigments