Description

C.I. Acid Yellow 204 is a synthetic monoazo acid dye widely used for its bright, vivid yellow hue and good fastness properties. This high-performance dye is valued for its strong affinity to protein fibers like wool, silk, and nylon, as well as its utility in coloring leather and paper. It is an essential component for manufacturers in the textile, leather finishing, and specialty paper industries seeking consistent, high-quality coloration.

Application

• Textile Dyeing: Primary application for dyeing wool, silk, and nylon fibers and fabrics.
• Leather Coloring: Used for dyeing leather goods, providing a uniform and durable yellow color.
• Paper Staining: Employed in the production of specialty papers, including decorative and security papers.
• Ink Formulation: A colorant component for certain types of inks, including inkjet and specialty printing inks.
• Biological Staining: Potential use as a microscopic stain in histology and cytology laboratories.
• Polymer Coloring: Can be used for mass coloration of specific synthetic polymers.

Basic Information

Product Name	C.I. Acid Yellow 204
CAS No.	61814-53-7
Molecular Formula	C16H12N4Na2O7S2
Molecular Weight	478.40 g/mol
Synonyms	Acid Yellow 204; Acid Leather Yellow RL; C.I. 18990; Acid Fast Yellow E-2G; Acid Yellow E-2G; Acid Yellow RL; Lanyl Yellow G; Supranol Yellow RL; Telon Yellow RL; Acid Yellow 204 (C.I. 18990)
EINECS	Contact for details

Quality Control

Our C.I. Acid Yellow 204 is manufactured under strict quality management systems to ensure batch-to-batch consistency and performance. Each lot is tested against rigorous internal specifications for color strength, shade, solubility, and impurity profiles. A comprehensive Certificate of Analysis (COA) detailing purity, physical properties, and performance metrics is provided with every shipment to guarantee it meets your application requirements.

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 and should be stored away from direct light exposure to prevent degradation.

Specification

Item	Specification
Appearance	Yellow to orange-yellow powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95%
Color Strength	100 ± 3% (vs. Standard)
Shade	Conforms to standard
Moisture Content	≤ 5.0%
Water Solubility	Conforms
Ash Content	≤ 1.0%

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