Description

Direct Blue 199 is a high-performance, water-soluble diazo dye belonging to the direct dye class, widely recognized for its excellent affinity to cellulosic fibers. Its primary value lies in delivering deep, brilliant blue shades with superior wash and light fastness properties, ensuring color consistency and durability in demanding applications. This product is essential for industrial operations in the textile dyeing and paper coloring sectors, where reliable and vibrant coloration is critical for product quality.

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 and paperboard to achieve uniform blue hues.
• Leather Finishing: Employed in the dyeing of leather goods to provide rich and penetrating blue colors.
• Ink Manufacturing: A colorant component in the formulation of certain types of inks, including for stationery and packaging.
• Biological Staining: Potential use as a histological stain in laboratory settings for microscopic analysis.

Basic Information

Product Name	Direct Blue 199
CAS No.	12222-04-7
Molecular Formula	C40H23N7Na4O13S4
Molecular Weight	1029.85 g/mol
Synonyms	Direct Blue 199; C.I. Direct Blue 199; Direct Blue 2B; Pontamine Blue 2B; Amanil Blue 2B; Sirius Blue S-R; Solophenyl Blue ARLE; Direct Blue 2B (C.I. 34219); Tetrasodium 8,8'-[carbonylbis(imino-4,1-phenyleneazo)]bis[7-hydroxy-1,3-naphthalenedisulfonate]
EINECS	Contact for details

Quality Control

Our Direct Blue 199 is manufactured under a strict quality management system to ensure batch-to-batch consistency and performance. Every lot is tested against stringent in-house specifications for key parameters such as color strength, shade, solubility, and impurity profile. A Certificate of Analysis (COA) detailing these results is provided with each shipment 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). Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	Dark blue to bluish-black powder
Identification (IR)	Conforms to standard
Assay (Color Strength)	≥ 95% (vs. Standard)
Moisture Content	≤ 5.0%
Water Solubility	Completely soluble
pH (1% Solution)	7.0 - 9.0
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.