Description

Direct Blue 78 is a synthetic, water-soluble disazo direct dye belonging to the benzidine derivative class. It is valued for its strong affinity to cellulosic fibers, providing deep, wash-fast blue colorations without the need for a mordant. This product is essential for manufacturers in the textile industry seeking reliable and cost-effective dyeing solutions for cotton, viscose, and paper. Its consistent performance makes it a key component for achieving uniform and vibrant blue shades in large-scale production.

Application

• Textile Dyeing: Primary application for dyeing cotton, rayon, viscose, and other cellulosic fibers to a deep blue shade.
• Paper Coloring: Used in the production of colored papers, tissues, and paperboard where a strong blue hue is required.
• Leather Finishing: Employed in the dyeing of leather goods to provide rich and durable blue colorations.
• Ink Formulation: A colorant component in the manufacture of certain types of inks, including stamp pad and flexographic inks.
• Biological Staining: May be utilized in specific histological or microbiological staining protocols as a contrast agent.

Basic Information

Product Name	Direct Blue 78
CAS No.	2503-73-3
Molecular Formula	C₃₂H₂₀N₆Na₂O₈S₂
Molecular Weight	750.64 g/mol
Synonyms	Direct Blue 2B; C.I. 34200; Amanil Sky Blue 2B; Atul Direct Sky Blue 2B; Benzo Sky Blue; Chloramine Sky Blue 2B; Diamine Sky Blue 2B; Direct Sky Blue 2B; Sirius Sky Blue 2B; Solophenyl Blue BL
EINECS	219-710-3

Quality Control

Our Direct Blue 78 is manufactured under a stringent quality management system to ensure batch-to-batch consistency and performance reliability. Each lot is tested against key parameters including color strength, shade, solubility, and fastness properties. A comprehensive Certificate of Analysis (COA) detailing purity, physical properties, and performance metrics is provided with every shipment to guarantee it meets your specific 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 and sources of heat. The product is light-sensitive and should be stored away from direct light exposure to maintain stability.

Specification

Item	Specification
Appearance	Blue to Bluish-Black Powder
Identification (IR)	Conforms to Standard
Color Strength	100 ± 3% (Standard)
Shade	Conforms to Standard
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 1.0%
Solubility in Water	Conforms
Fastness Properties	To be specified per grade

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