Description

Acid Yellow 219 is a synthetic organic dye belonging to the acid dye class, characterized by its bright yellow hue and good solubility in aqueous systems. This high-performance colorant is valued for its strong affinity to protein fibers like wool, silk, and nylon, delivering excellent wash and light fastness properties. It is an essential component for textile manufacturers, leather tanneries, and specialty ink producers seeking vibrant and durable yellow coloration.

Application

• Textile Dyeing: Primary application for dyeing wool, silk, nylon, and polyamide fibers to achieve bright yellow shades with good levelness.
• Leather Coloring: Used in the dyeing of leather goods, providing rich and uniform yellow colors.
• Paper Staining: Employed for coloring specialty papers, including decorative and security papers.
• Ink Formulation: A key pigment for manufacturing inks, including those for ballpoint pens, ink-jet printing, and stamp pads.
• Biological Staining: Potential use as a microscopic stain in histology and cytology laboratories.
• Food Contact Material Coloring: For coloring polymers and coatings intended for food packaging, where compliant grades are available.

Basic Information

Product Name	Acid Yellow 219
CAS No.	71819-57-3
Molecular Formula	C16H12N4Na2O7S2
Molecular Weight	478.40 g/mol
Synonyms	Acid Yellow 219; C.I. 19180; Acid Leather Yellow G; Naphthol Yellow S (related); 2,7-Naphthalenedisulfonic acid, 5-(acetylamino)-4-hydroxy-3-(phenylazo)-, disodium salt; Acid Fast Yellow G; Lissamine Yellow G; Acid Yellow G
EINECS	Contact for details

Quality Control

Every batch of Acid Yellow 219 is manufactured and tested under a strict quality management system. Our products undergo rigorous quality testing to ensure compliance with industry standards for strength, shade, and purity. Certificates of Analysis (COA) detailing parameters such as assay, impurity profile, and solubility are available upon request.

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 moisture to maintain product integrity.

Specification

Item	Specification
Appearance	Yellow to orange-yellow powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Water Solubility	Clear solution at 1% w/v
Ash Content	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm

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