Description

C.I. Acid Yellow 78 is a synthetic anionic dye belonging to the azo chemical class, identified by CAS NO 12220-56-3. It is valued for its bright, vivid yellow hue and good fastness properties, making it a critical coloring agent in demanding industrial applications. This product is primarily required by manufacturers in the textile, leather, and paper industries seeking reliable and consistent dye performance.

Application

• Textile Dyeing: Primary application for dyeing natural and synthetic fibers like wool, silk, and nylon, providing excellent color yield.
• Leather Coloring: Used in the dyeing of leather goods, offering good penetration and uniform color.
• Paper Staining: Employed for coloring paper products, including specialty papers and packaging materials.
• Ink Formulation: A component in the manufacture of inks for various printing applications.
• Biological Staining: Potential use as a stain in histological and microbiological laboratories.
• Plastics and Polymers: Can be used for coloring certain types of plastics and polymers.

Basic Information

Product Name	C.I. Acid Yellow 78
CAS No.	12220-56-3
Molecular Formula	C16H12N4Na2O7S2
Molecular Weight	490.40 g/mol
Synonyms	Acid Yellow 78; C.I. 18850; Acid Leather Yellow PG; Acid Fast Yellow E-2G; Acidol Yellow M-2GL; Amacid Yellow 2G; Derma Yellow PG; Lissamine Yellow 2G; Supranol Yellow PG; Telon Yellow PG
EINECS	235-417-5

Quality Control

Our C.I. Acid Yellow 78 is manufactured under a strict quality management system to ensure batch-to-batch consistency and high purity. Each lot is tested against rigorous internal specifications, which typically include parameters for color strength, shade, solubility, and impurity profile. A Certificate of Analysis (COA) detailing these results is provided with every shipment to guarantee compliance with your technical 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 strong oxidizing agents. 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)
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 1.0%
Ash Content	≤ 1.0%
pH (1% Solution)	6.0 - 8.0
Heavy Metals (as Pb)	≤ 20 ppm

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