Description

C.I. Direct Blue 85 is a high-performance, water-soluble direct dye belonging to the azo chemical class, identified by CAS NO 61724-72-9. It is valued for its excellent substantivity to cellulosic fibers, providing deep, vibrant blue shades with good wash and light fastness properties. This dye is essential for manufacturers in the textile and paper industries seeking reliable and efficient coloring solutions for bulk production.

Application

• Textile Dyeing: Primary application for dyeing cotton, viscose, rayon, and other cellulosic fibers in exhaust and continuous dyeing processes.
• Paper Coloring: Used for the mass coloration of paper pulp to produce uniformly colored paper products.
• Leather Finishing: Employed in the dyeing of leather goods to achieve consistent blue hues.
• Ink Formulation: A colorant component in the manufacture of certain types of inks.
• Biological Staining: Potential use as a histological stain in laboratory settings.

Basic Information

Product Name	C.I. Direct Blue 85
CAS No.	61724-72-9
Molecular Formula	C₃₂H₁₄CuN₈O₆S₂
Molecular Weight	782.28 g/mol
Synonyms	Direct Blue 85; Direct Blue 85 (C.I.); Direct Blue 2B; C.I. 24145; Direct Blue 2B (C.I. 24145); Copper complex of 4,4'-[[6-[(2-amino-8-hydroxy-6-sulfo-1-naphthyl)azo]-1,3,5-triazine-2,4-diyl]diimino]bis[5-hydroxy-2,7-naphthalenedisulfonic acid] tetrasodium salt; Amanil Sky Blue 2B; Atul Direct Sky Blue 2B
EINECS	262-933-8

Quality Control

Our C.I. Direct Blue 85 is manufactured under a stringent quality management system. Every batch is tested to ensure it meets precise specifications for color strength, shade, solubility, and impurity profiles. A Certificate of Analysis (COA) detailing purity, physical properties, and performance characteristics is provided with each shipment to guarantee consistency and compliance with your application requirements.

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 (store away from light).

Specification

Item	Specification
Appearance	Blue to Bluish-Gray Powder
Identification (IR)	Conforms to Standard
Color Strength	100 ± 3% (vs. Standard)
Shade	Conforms to Standard
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 0.5%
Solubility in Water	Conforms
pH (1% Solution)	6.0 - 8.0

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