Description

C.I. Acid Brown 26 is a synthetic azo dye belonging to the acid dye class, identified by CAS No. 6370-65-6. It is valued for its ability to impart a durable brown coloration to protein-based fibers like wool, silk, and nylon, offering good wash and light fastness properties. This dye is essential for manufacturers in the textile, leather, and specialty paper industries seeking consistent, high-quality brown shades for their products.

Application

• Primary dyeing of wool and silk fabrics and yarns.
• Coloration of nylon fibers in textile and carpet manufacturing.
• Leather dyeing for footwear, apparel, and upholstery.
• Staining and coloring of specialty papers and packaging materials.
• As a colorant for inks and coatings where acid dye compatibility is required.
• Used in biological staining applications for microscopy (subject to specific purity grades).

Basic Information

Product Name	C.I. Acid Brown 26
CAS No.	6370-65-6
Molecular Formula	C32H24N12Na4O16S4
Molecular Weight	1048.88 g/mol
Synonyms	Acid Brown 26; Acid Leather Brown D; C.I. 20170; Acid Fast Brown BRL; Acidol Brown M-BL; Amacid Brown BRL; Derma Fur Brown BRL; Lissamine Brown B; Supranol Fast Brown BRL; Telon Fast Brown BRL; Nylosan Brown N-BL; Acid Brown G; Acid Brown 2GL
EINECS	228-904-9

Quality Control

Our C.I. Acid Brown 26 is produced under a strict quality management system. Each batch undergoes comprehensive testing to ensure it meets precise color strength, shade, and purity specifications critical for industrial applications. A Certificate of Analysis (COA) detailing parameters such as dye content, solubility, and fastness properties is provided to guarantee batch-to-batch consistency and performance reliability.

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. The product is light-sensitive and should be stored away from direct light exposure to maintain stability.

Specification

Item	Specification
Appearance	Brown powder or granules
Identification (IR)	Conforms to standard
Dye Content (Assay)	≥ 95% (by HPLC)
Moisture Content	≤ 5.0% (Karl Fischer)
Water Solubility	Conforms
Shade	Conforms to standard pattern
Fastness Properties (Light, Wash)	Grade 4-5 (Standard tests)

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