Description

C.I. Direct Blue 291 is a synthetic, water-soluble direct dye belonging to the azo chemical class, identified by CAS NO 85977-50-0. It is valued for its strong affinity to cellulosic fibers, providing excellent wash and light fastness properties. This dye is essential for manufacturers in the textile industry seeking efficient and vibrant coloration for cotton, viscose, and other natural fibers.

Application

• Primary dyeing of cotton and viscose rayon fabrics and yarns.
• Coloration of paper and specialty paper products.
• Dyeing of leather in tanneries.
• Used in the production of ink for various printing applications.
• Potential use as a colorant for wood staining.
• Research and development applications in analytical chemistry as a staining agent.

Basic Information

Product Name	C.I. Direct Blue 291
CAS No.	85977-50-0
Molecular Formula	C40H23N7Na4O13S4
Molecular Weight	1081.86 g/mol
Synonyms	Direct Blue 291; C.I. 291; Direct Blue 291 (C.I.); Direct Blue 291, disodium salt; Direct Blue 291, tetrasodium salt; Direct Blue 291, sodium salt; 85977-50-0; Direct Blue 291 (C.I. Direct Blue 291)
EINECS	Contact for details

Quality Control

Our C.I. Direct Blue 291 is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing to ensure consistent shade, strength, and purity. Certificates of Analysis (COA) detailing key parameters such as color strength, solubility, and impurity profile are available upon request to support your quality assurance protocols.

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). This material is hygroscopic (moisture-sensitive); keep the container tightly sealed when not in use to prevent absorption of atmospheric moisture, which can affect performance.

Specification

Item	Specification
Appearance	Blue to dark blue powder
Identification (IR)	Conforms to standard
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
Water Solubility	Conforms
Shade	Conforms to standard
Fastness Properties	Contact for details

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