Description

Direct Red 79 is a synthetic azo dye belonging to the direct dye class, valued for its strong affinity to cellulosic fibers like cotton and rayon. Its primary commercial value lies in providing a bright, vivid red shade with good wash fastness properties in textile dyeing and printing applications. This dye is essential for manufacturers in the textile, leather, and paper industries seeking consistent, high-color-strength pigments for their products.

Application

• Textile Dyeing: Primary application for dyeing cotton, viscose rayon, and other cellulosic fibers to achieve a bright red hue.
• Leather Coloring: Used in the dyeing of leather goods, providing rich and uniform color penetration.
• Paper Staining: Employed in the production of colored papers, tissues, and packaging materials.
• Ink Formulation: A colorant component in the manufacturing of inks for various printing applications.
• Biological Staining: Potential use as a histological stain in laboratory settings for microscopic analysis.

Basic Information

Product Name	Direct Red 79
CAS No.	1937-34-4
Molecular Formula	C29H19N5Na2O8S2
Molecular Weight	675.60 g/mol
Synonyms	C.I. Direct Red 79; Direct Fast Scarlet 4BS; Pontamine Fast Scarlet 4BS; Amanil Fast Scarlet 4BS; Atul Direct Fast Scarlet 4BS; Direct Scarlet 4BS; Direct Red 4B; 1-Naphthalenesulfonic acid, 3-[[4-[[4-[(2,4-diaminophenyl)azo]phenyl]amino]-3-sulfophenyl]azo]-, disodium salt
EINECS	217-710-3

Quality Control

Our Direct Red 79 is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing to ensure it meets precise specifications for color strength, purity, and solubility. A Certificate of Analysis (COA) detailing assay, shade, and impurity profiles is provided with each shipment to guarantee consistency and performance for your industrial processes.

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 strong oxidizing agents.

Specification

Item	Specification
Appearance	Reddish-brown powder
Identification (IR)	Conforms to standard
Assay (HPLC)	Min. 95%
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	Max. 5.0%
Water Solubility	Conforms
Ash Content	Max. 1.0%

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