Description

C.I. Basic Red 43 is a synthetic cationic dye belonging to the triarylmethane class, identified by CAS NO 12221-67-9. It is valued for its intense and vibrant red coloration, excellent substantivity to polyanionic substrates, and good lightfastness in specific applications. This dye is primarily utilized in industries requiring high-performance colorants for technical and specialty applications.

Application

• Paper Coloring: Used for dyeing tissue paper, specialty papers, and paper products where a bright red hue is required.
• Ink Formulations: Employed in the manufacture of inks for flexographic, gravure, and inkjet printing, particularly on acidic substrates.
• Biological Staining: Serves as a histological stain in microscopy for contrasting tissues and cellular structures in laboratory settings.
• Leather Dyeing: Applied in the finishing of leather goods to achieve uniform and penetrating red shades.
• Acrylic Fiber Dyeing: Effective for coloring modified acrylic and basic-dyeable polyester fibers in the textile industry.
• Wood Staining: Used for imparting color to wood veneers and other lignocellulosic materials.
• Educational & Hobby Kits: Incorporated in chemistry sets and educational materials for demonstration purposes.
• Research & Development: Utilized as a chemical intermediate or marker in various chemical synthesis and analytical research projects.

Basic Information

Item	Detail
Product Name	C.I. Basic Red 43
CAS No.	12221-67-9
Molecular Formula	C25H30ClN3
Molecular Weight	407.98 g/mol
Synonyms	Basic Red 43; Astrazon Red FBL; Aizen Cathilon Red FBLH; Maxilon Red FBL; C.I. 11085; 1,3,3-Trimethyl-2-[(E)-2-(1,3,3-trimethylindolin-2-ylidene)ethylidene]indolium chloride; Victoria Pure Red; Pyrocatechol Violet (Note: often confused, but distinct); Cationic Red 43
EINECS	235-402-9

Quality Control

Our production of C.I. Basic Red 43 adheres to stringent quality management protocols to ensure batch-to-batch consistency and performance reliability. Each lot is analyzed against comprehensive specifications for color strength, hue, solubility, and impurity profile. Certificates of Analysis (COA) documenting these results are provided and available upon request to support your quality assurance processes.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Keep away from strong oxidizing agents. The product is light-sensitive (store away from light).

Specification

Item	Specification
Appearance	Dark red to reddish-brown powder
Identification (IR)	Conforms to standard
Color Strength	100 ± 3% (vs. Standard)
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Ash Content	≤ 1.0%
Water Solubility	Clear solution at 1%
pH (1% Solution)	4.0 - 6.0

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