Description

Acid Yellow 199 is a synthetic organic dye belonging to the acid dye class, widely recognized for its bright and stable yellow hue. This high-performance colorant is valued for its excellent lightfastness, wash fastness, and strong affinity for protein-based and polyamide fibers. It is a critical component for manufacturers in the textile, leather, and paper industries seeking vibrant, durable coloration. The compound is supplied under the identifier CAS No. 70865-20-2.

Application

Acid Yellow 199 is primarily used as a coloring agent in various industrial processes where a strong, stable yellow shade is required. Its key applications include:

• Textile Dyeing: For dyeing wool, silk, and nylon fibers, providing excellent color yield and fastness properties.
• Leather Finishing: Used in the coloration of leather goods, offering good penetration and uniform shade.
• Paper Coloring: Imparts a bright yellow color to specialty papers, including decorative and packaging grades.
• Ink Formulation: A component in the manufacture of inks for various printing applications.
• Biological Staining: Potential use as a stain in microscopy and histology due to its selective affinity.

Basic Information

Product Name	Acid Yellow 199
CAS No.	70865-20-2
Molecular Formula	C26H18N4Na2O8S2
Molecular Weight	624.55 g/mol
Synonyms	Acid Yellow 199; C.I. Acid Yellow 199; Acid Leather Yellow ARL; Nylosan Yellow E-RL; Telon Yellow RL; Acid Fast Yellow E-RL; Yellow 199; 2,7-Naphthalenedisulfonic acid, 5-[[4-[(2,5-dichlorophenyl)azo]-3-hydroxy-2,7-naphthalenedisulfonato(5-)]azo]-4-hydroxy-3-[(4-nitrophenyl)azo]-, sodium salt (1:2)
EINECS	Contact for details

Quality Control

Our Acid Yellow 199 is manufactured under a stringent quality management system to ensure batch-to-batch consistency and performance reliability. Each lot is tested against established specifications for color strength, shade, solubility, and impurity profiles. A Certificate of Analysis (COA) detailing purity, physical properties, and conformance is provided with every shipment 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 incompatible materials. The product is light-sensitive (store away from light).

Specification

Item	Specification
Appearance	Yellow to orange powder
Identification (IR)	Conforms to standard
Color Strength	100 ± 3% (vs. Standard)
Shade	Conforms to standard
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm
Solubility in Water	Clear solution

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