Description

Acid Brown 191 is a synthetic azo dye belonging to the acid dye class, widely recognized under the CAS registry number 61724-16-1. It is valued for its ability to provide durable, vibrant brown shades with excellent leveling properties on protein-based substrates. This product is essential for manufacturers in the textile and leather industries seeking consistent coloration and strong wash-fastness. Its reliable performance makes it a key component in formulations for dyeing wool, silk, and nylon.

Application

• Primary dyeing of wool and wool-blend textiles.
• Coloration of silk fabrics and garments.
• Dyeing of nylon fibers for apparel and industrial textiles.
• Leather dyeing for footwear, upholstery, and accessories.
• Used in the formulation of specialized ink and coating systems.
• Potential applications in the coloration of paper and specialty papers.

Basic Information

Product Name	Acid Brown 191
CAS No.	61724-16-1
Molecular Formula	C32H24N8Na2O8S2
Molecular Weight	750.69 g/mol
Synonyms	Acid Brown G; C.I. Acid Brown 191; Acid Leather Brown G; Lanasyn Brown G; Nylosan Brown E-R; Telon Brown G; Acid Fast Brown G; 2,7-Naphthalenedisulfonic acid, 5-[[4-[(2,4-diaminophenyl)azo]phenyl]azo]-3-hydroxy-4-[(4-nitrophenyl)azo]-, disodium salt
EINECS	Contact for details

Quality Control

Our Acid Brown 191 is manufactured under a strict quality management system to ensure batch-to-batch consistency and performance. Each lot is tested against key parameters including color strength, shade, solubility, and impurity profile to meet industry-standard specifications. A comprehensive Certificate of Analysis (COA) detailing purity, physical properties, and performance metrics is provided with every shipment.

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 strong oxidizing agents.

Specification

Item	Specification
Appearance	Brown powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 95%
Moisture Content	≤ 5.0%
Water Solubility	Conforms
Ash Content	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm

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