Description

Acid Yellow 29 is a synthetic organic dye belonging to the azo dye class, widely recognized for its bright, stable yellow hue. Its primary value lies in its excellent lightfastness and strong affinity for protein-based fibers like wool, silk, and nylon, making it a critical component for achieving durable coloration. This dye is essential for manufacturers in the textile, leather, and paper industries seeking high-performance colorants. It is also identified by the CAS registry number 6359-91-7.

Application

• Textile Dyeing: Primary application for dyeing wool, silk, and nylon fibers, providing vibrant and wash-fast yellow shades.
• Leather Finishing: Used in the coloration of leather goods, offering good penetration and color uniformity.
• Paper Coloring: Employed in the production of specialty papers, including decorative and packaging materials.
• Ink Formulation: A component in the manufacture of inks for various printing applications.
• Biological Staining: Potential use as a histological stain in laboratory settings for microscopic analysis.
• Plastics and Polymers: Can be used for coloring certain types of plastics and synthetic materials.

Basic Information

Product Name	Acid Yellow 29
CAS No.	6359-91-7
Molecular Formula	C16H11Cl2N4NaO5S2
Molecular Weight	513.30 g/mol
Synonyms	Acid Yellow 2G; C.I. 18900; Acid Leather Yellow 2G; Acid Fast Yellow 2G; Lissamine Yellow 2G; Acid Yellow GG; Wool Yellow 2G; 6,8-Dichloro-4-[2-(4-sulfophenyl)diazenyl]-2-naphthol Disodium Salt
EINECS	228-787-8

Quality Control

Our Acid Yellow 29 is manufactured under a stringent quality management system to ensure batch-to-batch consistency and performance. Each lot is tested against key parameters including color strength, shade, solubility, and impurity profile to meet industrial dye standards. A comprehensive Certificate of Analysis (COA) detailing purity, physical properties, and conformance to specification is provided with every shipment.

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.

Specification

Item	Specification
Appearance	Yellow to orange-yellow powder
Identification (IR)	Conforms to standard
Assay (HPLC)	Min. 95%
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	Max. 5.0%
Water Solubility	Conforms
Ash Content	Max. 1.0%
Heavy Metals (as Pb)	Max. 20 ppm

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