Description

Acid Yellow 127 is a synthetic organic dye belonging to the azo chemical class, widely recognized for its bright and stable yellow hue. This high-performance colorant is valued for its excellent lightfastness and wash fastness, making it a reliable choice for demanding applications. It is primarily utilized by manufacturers in the textile, leather, and specialty paper industries seeking consistent and vibrant coloration.

Application

• Textile Dyeing: Primary application for dyeing nylon, wool, and silk fibers to achieve bright yellow shades with good leveling properties.
• Leather Finishing: Used in the coloration of leather goods, providing rich and uniform yellow tones.
• Paper Staining: Employed in the production of specialty papers, including decorative and security papers, requiring color consistency.
• Ink Formulation: A component in the manufacture of inks for various printing applications.
• Biological Staining: Potential use as a microscopic stain in histology and cytology laboratories.
• Plastics and Polymers: Can be used for coloring certain types of plastics and synthetic materials.

Basic Information

Product Name	Acid Yellow 127
CAS No.	73384-78-8
Molecular Formula	C16H13N4NaO4S
Molecular Weight	380.35 g/mol
Synonyms	Acid Fast Yellow EFC; C.I. Acid Yellow 127; Acid Yellow EFC; Acid Yellow 127 (C.I. 19120); 2,7-Naphthalenedisulfonic acid, 5-[(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo]-4-hydroxy-, sodium salt (1:1); Sodium 5-[(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo]-4-hydroxy-2,7-naphthalenedisulfonate; Yellow Acid Leather Dye EFC
EINECS	Contact for details

Quality Control

Our Acid Yellow 127 is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing, including spectrophotometric analysis and chromatography, to ensure it meets precise color strength and purity specifications. Certificates of Analysis (COA) documenting key parameters such as assay, shade, and solubility are available upon request to support your quality assurance protocols.

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).

Specification

Item	Specification
Appearance	Yellow to orange powder
Identification (IR)	Conforms
Assay (HPLC)	Min. 95%
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	Max. 5.0%
Water Solubility	Conforms
Ash Content	Max. 0.5%

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