Description

C.I. Acid Yellow 104 is a synthetic, water-soluble azo dye belonging to the acid dye class, widely recognized for its bright and vivid yellow hue. This high-performance colorant is valued for its strong affinity to protein fibers like wool, silk, and nylon, providing excellent colorfastness and leveling properties. It is a critical component for manufacturers in the textile, leather, and paper industries seeking durable and vibrant coloration solutions.

Application

• Textile Dyeing: Primary application for dyeing wool, silk, nylon, and modified acrylic fibers, offering good wash and light fastness.
• Leather Finishing: Used for coloring leather goods, providing rich and uniform shades with good penetration.
• Paper Coloring: Employed in the production of specialty papers, decorative papers, and paper coatings.
• Ink Formulation: A component in the manufacture of inks for various printing applications.
• Biological Staining: Potential use as a histological stain in laboratory settings for microscopic analysis.
• Other Industrial Uses: Applicable in the coloration of anodized aluminum, wood stains, and other specialty materials.

Basic Information

Product Name	C.I. Acid Yellow 104
CAS No.	12220-72-3
Molecular Formula	C16H12N4Na2O7S2
Molecular Weight	478.40 g/mol
Synonyms	Acid Yellow 104; Acid Leather Yellow EG; C.I. 14240; Acid Fast Yellow EG; Aizen Acid Yellow EG; Amacid Yellow EG; Derma Yellow EG; Lissamine Yellow 2G; Supranol Yellow EG; Wool Yellow EG; 2,2'-[(3,3'-Dimethoxy[1,1'-biphenyl]-4,4'-diyl)bis(azo)]bis[5-aminobenzenesulfonic acid] disodium salt
EINECS	235-417-7

Quality Control

Our production of C.I. Acid Yellow 104 adheres to stringent quality management protocols to ensure batch-to-batch consistency and performance reliability. Each lot is tested against key parameters including color strength, shade, solubility, and impurity profile. A comprehensive Certificate of Analysis (COA) detailing purity, physical properties, and conformance to specification 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 and incompatible materials. The product is light-sensitive (store away from light).

Specification

Item	Specification
Appearance	Yellow to orange-brown powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95.0%
Color Strength	100 ± 3% (vs. Standard)
Shade	Conforms to standard
Moisture Content	≤ 5.0%
Water Solubility	Clear solution at 1%
Ash Content	≤ 1.0%

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