Description

Basic Blue 21 is a synthetic cationic dye belonging to the triarylmethane class, widely recognized for its brilliant blue hue and strong affinity for polyacrylonitrile fibers. Its primary commercial value lies in its exceptional color strength and fastness properties, making it a critical component for achieving deep, vibrant shades in industrial dyeing processes. This product is essential for manufacturers in the textile, paper, and specialty ink industries seeking reliable and consistent colorants for synthetic materials.

Application

• Textile Dyeing: Primary application for dyeing acrylic, modacrylic, and other cationic-dyeable synthetic fibers.
• Paper Coloring: Used in the production of colored papers, tissues, and specialty packaging materials.
• Ink Manufacturing: A key pigment for creating blue shades in inks for non-impact printing and security applications.
• Leather Finishing: Employed in dyeing leather goods to provide uniform and durable blue coloration.
• Biological Staining: Utilized in histology and microbiology as a staining agent for microscopic analysis.
• Plastics and Polymers: Incorporated for mass coloration of certain plastics and polymer masterbatches.

Basic Information

Product Name	Basic Blue 21
CAS No.	54392-42-6
Molecular Formula	C₂₀H₂₆N₃O⁺ • Cl⁻
Molecular Weight	359.89 g/mol (for cation)
Synonyms	Astrazon Blue BG; Aizen Cathilon Blue BG; C.I. Basic Blue 21; Maxilon Blue BG; 4-[(4-Dimethylaminophenyl)(4-methylaminophenyl)methylene]-N,N-dimethylcyclohexa-2,5-dien-1-iminium chloride; Victoria Pure Blue BO; Sevron Blue BG; Basic Blue G
EINECS	259-179-1

Quality Control

Our Basic Blue 21 is manufactured under a strict quality management system to ensure batch-to-batch consistency and performance reliability. Each lot is tested against comprehensive specifications for color strength, shade, solubility, and impurity profiles. A Certificate of Analysis (COA) detailing purity, physical properties, and conformance to agreed specifications is provided with every 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. The product is light-sensitive and should be stored away from direct light exposure to maintain stability.

Specification

Item	Specification
Appearance	Dark blue to greenish-blue powder
Identification (IR)	Conforms to standard
Assay (HPLC)	Min. 95%
Color Strength	100 ± 5% (vs. Standard)
Moisture Content	Max. 5.0%
Water Solubility	Completely soluble
Ash Content	Max. 1.0%

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