Description

Acid Yellow 34 (C.I. 18890) CAS NO 6359-90-6 is a synthetic, water-soluble monoazo dye belonging to the acid dye class, valued for its bright, greenish-yellow hue and good lightfastness. It is a critical colorant for achieving vibrant and durable yellow shades in various industrial applications where color stability is paramount. This product is essential for manufacturers in the textile, leather, paper, and specialty ink industries seeking reliable and consistent coloring performance.

Application

• Textile Dyeing: Primarily used for dyeing protein fibers like wool, silk, and nylon, as well as for coloring polyamide fibers, providing excellent leveling and wash-fastness properties.
• Leather Finishing: Imparts a uniform and bright yellow color to leather goods, including footwear, apparel, and upholstery.
• Paper Coloration: Employed in the production of colored papers, tissues, and packaging materials where a stable yellow color is required.
• Ink Manufacturing: Used in the formulation of inks for ballpoint pens, stamp pads, and other specialty writing instruments.
• Wood Staining: Applied in stains and coatings for wood to achieve decorative yellow finishes.
• Biological Staining: Finds use in specific histology and microscopy applications as a biological stain.

Basic Information

Product Name	Acid Yellow 34
CAS No.	6359-90-6
Molecular Formula	C16H13N4NaO4S
Molecular Weight	380.35 g/mol
Synonyms	Acid Yellow 34; C.I. 18890; Food Yellow 4; Tartrazine (industrial grade); FD&C Yellow 5 (industrial grade); E102; Trisodium 5-hydroxy-1-(4-sulfonatophenyl)-4-((4-sulfonatophenyl)azo)-1H-pyrazole-3-carboxylate; Acid Leather Yellow T
EINECS	228-782-5

Quality Control

Our production of Acid Yellow 34 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 profiles. While this industrial-grade product is manufactured under controlled conditions, we provide comprehensive Certificates of Analysis (COA) upon request to support your quality assurance and regulatory compliance needs.

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). This material is hygroscopic (moisture-sensitive); ensure the container is kept tightly sealed to prevent absorption of atmospheric moisture which may affect product performance.

Specification

Item	Specification
Appearance	Yellow to orange-yellow powder
Identification (IR)	Conforms to standard
Assay (HPLC)	Min. 85%
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	Max. 5.0%
Water Solubility	Clear solution at 1%
Ash Content (Sulfated)	Max. 30%
Heavy Metals (as Pb)	Max. 20 ppm

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