Description

Basic Yellow 51 is a synthetic cationic dye belonging to the methine or polymethine class, widely recognized for its vibrant yellow hue. This compound is valued for its strong affinity to polyanionic materials, particularly in the coloration of acrylic fibers, where it provides excellent color fastness and brightness. Key industrial users include manufacturers of synthetic textiles, paper, leather, and specialty inks, where consistent color quality is paramount. Its utility extends to research and analytical applications as a biological stain or pH indicator.

Application

• Textile Dyeing: Primary application for dyeing acrylic and modacrylic fibers, as well as for dyeing paper and leather.
• Ink Manufacturing: Used in the formulation of specialty inks for printing and writing instruments.
• Biological Staining: Employed in microscopy and histology as a fluorescent stain or counterstain in biological research.
• Indicator Applications: Can function as a pH or oxidation-reduction indicator in analytical chemistry.
• Plastics and Polymers: Used for mass coloration of certain plastics and polymers to achieve specific yellow shades.
• Liquid Crystal Displays (LCDs): Potential application as a dichroic dye in guest-host LCD systems.

Basic Information

Product Name	Basic Yellow 51
CAS No.	88385-22-2
Molecular Formula	C23H23N2+ • Cl-
Molecular Weight	366.90 g/mol (for chloride salt)
Synonyms	Astrazon Yellow 8GL; Aizen Cathilon Yellow 8GLH; Basacryl Yellow X-8GL; Maxilon Yellow 8GL; C.I. Basic Yellow 51; 1-Ethyl-2-[(1-ethyl-2(1H)-quinolinylidene)methyl]quinolinium chloride; Quinolinium, 1-ethyl-2-[(1-ethyl-2(1H)-quinolinylidene)methyl]-, chloride
EINECS	Contact for details

Quality Control

Every batch of Basic Yellow 51 is manufactured and tested under a strict quality management system. We ensure the product meets high-purity standards suitable for industrial and technical applications, with key parameters including color strength, shade, and solubility rigorously verified. A Certificate of Analysis (COA) detailing purity, identity, and physical properties is provided with each shipment to guarantee consistency and traceability.

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 incompatible materials and sources of ignition. The product is light-sensitive and should be stored away from direct light exposure to prevent degradation.

Specification

Item	Specification
Appearance	Yellow to orange-yellow powder
Identification (IR)	Conforms to structure
Assay (HPLC)	Min. 95%
Color Strength	100 ± 5% (vs. Standard)
Moisture Content	Max. 2.0%
Ash Content	Max. 0.5%
Solubility (in water)	Clear solution at 1%

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