Description

3-Hydroxy-4-[(2-Hydroxynaphthyl)Azo]Naphthalene-1-Sulphonic Acid is a high-purity azo dye intermediate and analytical reagent. This compound is valued for its precise chromophoric properties and consistent performance in demanding synthesis and testing applications. It is primarily required by manufacturers in the dye and pigment industry, as well as by research and quality control laboratories for specialized chemical analysis.

Application

• Key intermediate in the synthesis of azo dyes and pigments, particularly for shades of red, brown, and black.
• Used as a complexometric indicator in analytical chemistry for the titration of metal ions.
• Employed in the production of specialized inks and colorants for industrial printing.
• Acts as a reagent-grade chemical in research and development for photochemical studies.
• Potential use in the formulation of sensitizers and light-absorbing materials.
• Utilized in educational and reference standards for chromatography and spectroscopy.

Basic Information

Product Name	3-Hydroxy-4-[(2-Hydroxynaphthyl)Azo]Naphthalene-1-Sulphonic Acid
CAS No.	2538-79-6
Molecular Formula	C₂₀H₁₄N₂O₅S
Molecular Weight	394.40 g/mol
Synonyms	Acid Chrome Blue R; C.I. Mordant Blue 1; C.I. 15710; 1-Naphthalenesulfonic acid, 3-hydroxy-4-[(2-hydroxy-1-naphthalenyl)azo]-; Alizarin Bordeaux B; Chrome Azurol S; Ericchrome Azurol B; Mordant Blue 1
EINECS	219-793-7

Quality Control

Our production of 3-Hydroxy-4-[(2-Hydroxynaphthyl)Azo]Naphthalene-1-Sulphonic Acid adheres to stringent quality management protocols. Every batch is tested to ensure it meets precise chemical and physical specifications, with a focus on purity, color strength, and consistency. Certificates of Analysis (COA) documenting identity, assay, and impurity profiles are available upon request to support your quality assurance and regulatory needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Keep away from incompatible materials such as strong oxidizing agents. Due to its light-sensitive nature, prolonged exposure to direct light should be avoided to maintain product integrity.

Specification

Item	Specification
Appearance	Dark red to brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0%
Sulfated Ash	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm
Solubility (1% in NaOH)	Complete, clear solution

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