3618-58-4

Basic information

• Product Name: Eriochrome Black A
• Synonyms: Acid mordant Black 1;1-Naphthalenesulfonic acid, 3-hydroxy-4-(2-hydroxy-1-naphthalenyl)azo-7-nitro-, monosodium salt;C.I.MORDANTBLACK1;Acid chrome black A;Chromogene Black VA;Diacromo Black AS;Mordant black 1 (C.I. 15710);2',3-Dihydroxy-7-nitro-(1',4-azobisnaphthalene)-1-sulfonic acid sodium salt
• CAS NO: 3618-58-4
• Molecular Formula: C20H12N3NaO7S
• Molecular Weight: 461.38
• EINECS: 222-807-9
• Mol File: 3618-58-4.mol
• Article Data: 0

Chemical Properties

• Appearance: /
• Density: 1.64g/cm³
• Refractive Index: 1.747
• CAS DataBase Reference: Eriochrome Black A(CAS DataBase Reference)
• NIST Chemistry Reference: Eriochrome Black A(3618-58-4)
• EPA Substance Registry System: Eriochrome Black A(3618-58-4)

Safety Data

• Hazardous Substances Data: 3618-58-4(Hazardous Substances Data)

Usage

Description

Eriochrome Black A, also known as Solochrome Black, is a synthetic azo dye characterized by its blue light gray to black color. It appears as a black powder and is soluble in water, producing a navy blue color with a water solubility of 60 g/l at 80°C. It is slightly soluble in ethanol and acetone. When dissolved in concentrated sulfuric acid, it turns blue and turns yellow upon dilution to light brown. In concentrated nitric acid, it exhibits a red-orange color. Its aqueous solution is navy blue, which turns pale yellow light brown upon the addition of concentrated hydrochloric acid. When strong caustic is added, it turns orange brown. Eriochrome Black A is used for dyeing wool, producing a light purple color with slight white streaks when dyed in nitric acid.

Uses

Used in Textile Industry:
Eriochrome Black A is used as a dye for wool fabric, providing excellent colorfastness properties. It is also suitable for dyeing silk and nylon, as well as for dyeing wool and various fiber blended fabrics. Additionally, it can be used for direct printing on wool fabric after acetic acid chromium pretreatment.
Used in Leather Industry:
Eriochrome Black A is also utilized in the leather dyeing process, offering a deep and vibrant color to the leather products.
Standard:
Eriochrome Black A meets various industry standards for colorfastness, including:
Ironing Fastness: ISO 4-5, AATCC 4-5
Light Fastness: ISO 5, AATCC 5
Fulling: ISO 4-5, AATCC 4-5
Perspiration Fastness: ISO 5, AATCC 5
Soaping: ISO 5, AATCC 5
Water: ISO 5
Alkali: ISO 5
Acid: ISO 5

Preparation

4-Amino-3-hydroxy-7-nitronaphthalene-1-sulfonic acid diazotization, and Naphthalen-2-ol coupling.

Standard

Ironing Fastness

Alkali

Acid

ISO

4-5

AATCC

4-5

InChI:InChI=1/C20H13N3O7S/c24-16-8-5-11-3-1-2-4-13(11)19(16)21-22-20-14-7-6-12(23(26)27)9-15(14)18(10-17(20)25)31(28,29)30/h1-10,21,24H,(H,28,29,30)/b22-20-