Description

C.I. Direct Blue 59 is a synthetic, water-soluble anionic dye belonging to the direct dye class, widely recognized for its strong affinity to cellulosic fibers. This product is valued for its excellent build-up properties, good lightfastness, and reliable performance in industrial dyeing processes. It is primarily used by manufacturers in the textile industry for coloring cotton, viscose, and other regenerated cellulose materials, as well as in the paper and leather industries.

Application

• Primary dyeing of cotton yarn and fabrics in exhaust and continuous dyeing processes.
• Coloration of viscose rayon and other regenerated cellulose fibers.
• Dyeing of paper pulp for the production of colored paper and board.
• Leather finishing for imparting color to leather goods.
• Used in the formulation of ink for specific printing applications.
• Potential use as a biological stain in laboratory settings.

Basic Information

Product Name	C.I. Direct Blue 59
CAS No.	61968-20-5
Molecular Formula	C34H24N6Na4O16S4
Molecular Weight	992.80 g/mol
Synonyms	Direct Blue 59; Direct Blue 59 (C.I.); Direct Blue 59, disodium salt; Direct Blue 2B; Amanil Sky Blue 2B; Atul Direct Sky Blue 2B; Chlorantine Sky Blue 2B; Sirius Supra Blue 2B; Solophenyl Blue 2B; Diazol Sky Blue 2B; C.I. 24400
EINECS	Contact for details

Quality Control

Our C.I. Direct Blue 59 is manufactured under a strict quality management system to ensure batch-to-batch consistency and performance reliability. Each production lot undergoes comprehensive analysis, including strength, shade, solubility, and fastness property testing. A Certificate of Analysis (COA) detailing all relevant specifications is provided with every shipment to guarantee compliance with your technical 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 strong oxidizing agents. The product is light-sensitive (store away from light).

Specification

Item	Specification
Appearance	Blue to dark blue powder
Identification (IR)	Conforms to standard
Color Strength	100 ± 3% (vs. Standard)
Shade	Conforms to standard
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 1.0%
Solubility in Water	Conforms
pH (1% Solution)	7.0 - 9.0

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