Description

C.I. Basic Yellow 59 is a synthetic cationic dye belonging to the methine class, widely recognized for its bright, intense yellow hue. This product is valued for its excellent tinctorial strength and good lightfastness, making it a reliable colorant for demanding industrial applications. It is primarily sought after by manufacturers in the textile, paper, and specialty ink industries seeking consistent, high-quality coloration.

Application

• Textile Dyeing: Primarily used for dyeing acrylic fibers, modacrylic, and acid-modified polyesters, offering good leveling and build-up properties.
• Paper Coloring: Employed in the production of colored papers, tissues, and paperboard where a vibrant yellow shade is required.
• Ink Formulation: A key component in the manufacture of flexographic, gravure, and specialty inks for packaging and security printing.
• Leather Finishing: Used for dyeing leather goods to achieve uniform and attractive yellow finishes.
• Biological Staining: Finds application as a histological stain in laboratory settings for microscopic analysis.
• Plastics and Polymers: Can be used for mass coloration of certain plastics where compatibility is confirmed.

Basic Information

Product Name	C.I. Basic Yellow 59
CAS No.	78170-39-5
Molecular Formula	C21H23N3O3S
Molecular Weight	397.49 g/mol
Synonyms	Basic Yellow 59; C.I. 49160; Aizen Cathilon Yellow 5GLH; Astrazon Yellow 5GL; Maxilon Yellow 5GL; Sevron Yellow 5GL; Sumiacryl Yellow E-5G; Yation Yellow 5GL; 2-[[4-[Ethyl(3-sulfobenzyl)amino]phenyl]azo]-6-methoxy-3-methylbenzothiazolium hydroxide inner salt
EINECS	Contact for details

Quality Control

Our production of C.I. Basic Yellow 59 adheres to stringent quality management protocols to ensure batch-to-batch consistency and performance. Each lot is tested against established specifications for color strength, shade, solubility, and impurity profile. A comprehensive Certificate of Analysis (COA) detailing purity, physical properties, and conformance is provided with every shipment.

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 strong oxidizing agents. Under these conditions, the product has excellent shelf stability.

Specification

Item	Specification
Appearance	Yellow to orange-yellow powder
Identification (IR)	Conforms to standard
Color Strength	100 ± 3% (vs. Standard)
Shade	Within agreed tolerance
Moisture Content	≤ 5.0%
Ash Content	≤ 1.0%
Water Solubility	Clear solution at 1%

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