Description

C.I. Direct Blue 53 is a synthetic, water-soluble disazo direct dye belonging to the benzidine derivative class. Its primary value lies in its strong affinity for cellulosic fibers like cotton and rayon, producing deep, vibrant blue shades with good wash fastness. This dye is essential for industrial textile dyeing and paper coloration processes. It is also utilized in specialized applications such as biological staining and as a colorant for leather and ink formulations.

Application

• Textile Dyeing: Primary application for dyeing cotton, viscose rayon, and other cellulosic fabrics to achieve navy to blackish-blue shades.
• Paper Coloring: Used in the mass coloration of paper products, including specialty papers and boards.
• Leather Finishing: Imparts color to leather goods in the tanning industry.
• Biological Staining: Serves as a histological stain in laboratory settings for microscopic analysis.
• Ink Manufacturing: Acts as a colorant for certain types of inks, including stamp pad inks.
• Wood Staining: Employed for coloring wood and related materials.

Basic Information

Product Name	C.I. Direct Blue 53
CAS No.	6968-33-8
Molecular Formula	C34H24N6Na4O16S4
Molecular Weight	960.80 g/mol
Synonyms	Direct Blue 53; Pontamine Blue 3BX; Direct Blue 3B; C.I. 23860; Direct Blue B; Benzo Dark Blue 3B; Chlorazol Blue 3B; Diamine Blue 3B; Sirius Blue 3B; Diazol Blue 3B
EINECS	230-189-5

Quality Control

Our C.I. Direct Blue 53 is manufactured under a strict quality management system. Each batch is tested to ensure consistent shade, strength, solubility, and impurity profile. Key parameters such as dye content, salt content, and fastness properties are verified. A Certificate of Analysis (COA) detailing these 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, well-ventilated area at room temperature (15-25°C). Keep away from incompatible materials. Due to its light-sensitive nature, prolonged exposure to direct light should be avoided to prevent color degradation.

Specification

Item	Specification
Appearance	Dark Blue to Bluish-Black Powder
Identification (IR)	Conforms to Standard
Dye Content (by Titration)	≥ 95%
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 0.5%
Shade	Conforms to Standard
Solubility in Water	Conforms
Fastness Properties (Typical)	Light: 4-5; Wash: 3-4

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