Description

C.I. Basic Yellow 12 is a synthetic cationic dye belonging to the methine class, identified by CAS number 4208-81-5. It is valued for its bright, intense yellow hue and strong affinity for substrates with anionic surfaces, providing excellent color value and fastness properties. This product is essential for manufacturers in the textile, paper, and specialty ink industries seeking reliable and consistent coloration for synthetic fibers and other materials.

Application

• Primary dyeing and printing of acrylic fibers and modacrylics.
• Coloration of paper and paperboard for decorative and functional purposes.
• Manufacturing of specialty inks, including jet printing inks and security inks.
• Biological staining applications in histology and microscopy.
• As a colorant for leather and fur.
• Production of dyed plastics and masterbatches.
• Research and development as a chemical intermediate for synthesizing other dyes or functional molecules.

Basic Information

Product Name	C.I. Basic Yellow 12
CAS No.	4208-81-5
Molecular Formula	C21H29N3O3S
Molecular Weight	403.54 g/mol
Synonyms	Basic Yellow 12; Astrazon Yellow 7GLL; Aizen Cathilon Yellow 7GLH; Maxilon Yellow 7GL; Sevron Yellow L; C.I. 48025; 1H-Benz[e]indolium, 2-[2-[4-(diethylamino)phenyl]ethenyl]-3-methyl-, methyl sulfate; 2-[2-[4-(Diethylamino)phenyl]ethenyl]-3-methyl-1H-benz[e]indolium methyl sulfate
EINECS	224-123-8

Quality Control

Our C.I. Basic Yellow 12 is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing to ensure it meets precise color strength, shade, and purity specifications. A Certificate of Analysis (COA) detailing key parameters such as assay, solubility, and ash content is provided with each shipment to guarantee consistency and performance for your application.

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 heat sources and incompatible materials. Due to its light-sensitive nature, prolonged exposure to direct light should be avoided to maintain product stability and color integrity.

Specification

Item	Specification
Appearance	Yellow to orange-yellow powder
Identification (IR)	Conforms to standard
Color Strength	100% ± 3% (vs. Standard)
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Ash Content	≤ 1.0%
Solubility in Water	Clear, complete solution
pH (1% Solution)	4.0 - 7.0

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