Description

7-Amino-4-Hydroxy-3-[[2-Sulpho-4-[(4-Sulphophenyl)Azo]Phenyl]Azo]Naphthalene-2-Sulphonic Acid is a high-purity, sulfonated azo dye intermediate essential for producing vibrant and colorfast dyes and pigments. Its complex molecular structure, featuring multiple sulfonic acid groups, provides excellent water solubility and strong affinity for various substrates, making it a critical building block for advanced colorants. This compound is primarily needed by manufacturers in the textile, ink, and specialty chemical industries seeking to develop high-performance dyes with superior stability and hue.

Application

• Primary Intermediate for Azo Dyes: Serves as a key precursor in the synthesis of acid dyes, direct dyes, and reactive dyes for textile fibers like wool, silk, and nylon.
• Pigment Manufacturing: Used in the production of high-quality, water-soluble pigments for inks, including those for digital textile printing.
• Specialty Colorants: Employed in the formulation of specialized dyes for leather, paper, and food coloring (where specific purity grades and regulatory compliance are met).
• Research & Development: Acts as a standard or starting material in chemical research for developing new chromophores and functional dyes.
• Biological Staining: Potential use in the preparation of histological stains for microscopy, given its chromophoric properties.

Basic Information

Product Name	7-Amino-4-Hydroxy-3-[[2-Sulpho-4-[(4-Sulphophenyl)Azo]Phenyl]Azo]Naphthalene-2-Sulphonic Acid
CAS No.	56499-46-8
Molecular Formula	C22H16N4O9S3
Molecular Weight	576.57 g/mol
Synonyms	Acid Black 210; C.I. 28440; 7-Amino-4-hydroxy-2-naphthalenesulfonic acid-3-azo-4‘-sulfo-2‘-azo-4‘‘-sulfobenzene; 2-Naphthalenesulfonic acid, 7-amino-4-hydroxy-3-[[2-sulfo-4-[(4-sulfophenyl)azo]phenyl]azo]-; 3-[[2-Sulfo-4-[(4-sulfophenyl)azo]phenyl]azo]-7-amino-4-hydroxy-2-naphthalenesulfonic acid; Azo dye intermediate 56499-46-8; 4-Amino-5-hydroxy-3-[(E)-[4-[(E)-(4-sulfophenyl)diazenyl]phenyl]diazenyl]-6,8-naphthalenedisulfonic acid
EINECS	Contact for details

Quality Control

Our production of 7-Amino-4-Hydroxy-3-[[2-Sulpho-4-[(4-Sulphophenyl)Azo]Phenyl]Azo]Naphthalene-2-Sulphonic Acid adheres to stringent quality management protocols. Every batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure consistency and compliance with customer specifications. Certificates of Analysis (COA) documenting key parameters such as assay, impurity profile, and physical characteristics are provided to guarantee traceability and supply chain reliability.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept sealed to prevent absorption of atmospheric moisture, which can affect product quality and handling properties.

Specification

Item	Specification
Appearance	Dark brown to black powder or crystalline solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0% (typical ≥ 98.0%)
Loss on Drying	≤ 5.0%
Sulfated Ash	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm
Water Solubility	Freely soluble

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.