Description

Acid Yellow 49 is a synthetic organic dye belonging to the azo chemical class, widely recognized for its bright, vivid yellow hue. This high-performance colorant is valued for its strong tinctorial strength and good fastness properties, making it a critical component for achieving consistent and durable coloration. It is primarily utilized by manufacturers in the textile, leather, and paper industries for dyeing and printing applications where a stable yellow shade is required.

Application

• Textile Dyeing: Primary application for dyeing natural and synthetic fibers, including wool, silk, and nylon, to achieve bright yellow shades.
• Leather Finishing: Used in the coloration of leather goods, providing vibrant and uniform color for products like upholstery, apparel, and accessories.
• Paper Coloring: Employed in the production of colored papers, specialty packaging, and decorative paper products.
• Ink Formulation: A key pigment in the manufacture of inks for various printing processes, including flexographic and gravure printing.
• Biological Staining: Potential use as a histological stain in laboratory settings for microscopic analysis.
• Plastics and Polymers: Can be incorporated for coloring certain types of plastics and polymeric materials.

Basic Information

Product Name	Acid Yellow 49
CAS No.	12239-15-5
Molecular Formula	C16H13N4NaO4S
Molecular Weight	380.35 g/mol
Synonyms	Acid Yellow 49; C.I. 18640; Food Yellow 3; Tartrazine (Note: Tartrazine is a closely related but distinct dye, often confused; verify specific isomer); Trisodium 5-hydroxy-1-(4-sulfonatophenyl)-4-((4-sulfonatophenyl)azo)-1H-pyrazole-3-carboxylate; Acid Leather Yellow PG; Lissamine Yellow 2G; Acid Fast Yellow PG; Yellow No. 5 (industrial grade)
EINECS	235-428-9

Quality Control

Our Acid Yellow 49 is manufactured under a strict quality management system to ensure batch-to-batch consistency and reliability. Each lot is tested against stringent in-house specifications for critical parameters such as color strength, shade, solubility, and impurity profile. While produced to industrial-grade standards, we can discuss compliance with specific regulatory needs. A Certificate of Analysis (COA) detailing purity, physical properties, and test results 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 strong oxidizing agents. The product is light-sensitive (store away from light) and hygroscopic (moisture-sensitive); ensure containers are sealed after each use to prevent moisture absorption and caking.

Specification

Item	Specification
Appearance	Yellow to orange-yellow powder
Identification (IR)	Conforms to standard
Assay (HPLC)	Min. 85%
Color Strength	95 - 105% (vs. Standard)
Moisture Content	Max. 5.0%
Water Solubility	Freely soluble
Ash Content	Max. 30.0%
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.