Description

C. I. Acid Red 261 is a synthetic, water-soluble azo dye belonging to the acid dye class, widely recognized for its vibrant red hue. Its primary value lies in its excellent affinity for protein fibers like wool, silk, and nylon, providing strong, wash-fast coloration. This dye is essential for manufacturers in the textile, leather, and paper industries seeking reliable and consistent red shades for their products.

Application

• Textile Dyeing: Primary application for dyeing wool, silk, nylon, and modified acrylic fibers to achieve bright red shades with good fastness properties.
• Leather Finishing: Used for coloring leather goods, providing rich and uniform coloration.
• Paper Staining: Employed in the production of colored papers, specialty tissues, and decorative paper products.
• Ink Formulation: A component in the manufacture of inks for various printing applications.
• Biological Staining: Potential use as a histological stain in laboratory settings for microscopic analysis.
• Polymer Coloring: Can be used for mass coloration of certain plastics and polymers.

Basic Information

Product Name	C. I. Acid Red 261
CAS No.	61931-17-7
Molecular Formula	C22H14N4Na2O7S2
Molecular Weight	556.48 g/mol
Synonyms	Acid Red 261; C.I. 18129; Acid Leather Red G; Nylosan Red F-3GL; Telon Red F3GL; Acid Fast Red G; Acid Brilliant Red 3G; 2,7-Naphthalenedisulfonic acid, 5-[[4-[(2,5-dichlorophenyl)azo]-1-naphthalenyl]azo]-, disodium salt
EINECS	Contact for details

Quality Control

Our C. I. Acid Red 261 is manufactured under strict quality management systems to ensure batch-to-batch consistency and performance. Each lot is tested against stringent internal specifications for color strength, shade, solubility, and impurity profiles. A comprehensive Certificate of Analysis (COA) detailing purity, physical properties, and performance tests is provided with every shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, 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.

Specification

Item	Specification
Appearance	Reddish-brown powder
Identification (IR)	Conforms to standard
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 0.5%
Ash Content	≤ 30.0%
pH (1% Solution)	6.0 - 8.0
Shade	Conforms to standard

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