Description

Acid Yellow 7 is a synthetic organic dye belonging to the azo dye class, widely recognized for its bright, greenish-yellow hue. This colorant is valued for its strong tinctorial strength and good solubility in water, making it a versatile and efficient choice for industrial coloring applications. It is primarily used in the textile industry for dyeing wool, silk, and nylon, and is also a key component in the formulation of inks, paper, and leather products.

Application

• Textile Dyeing: Primary application for dyeing protein fibers such as wool and silk, as well as polyamide fibers like nylon, providing vibrant yellow shades.
• Leather Coloring: Used in the tanning industry to impart consistent and durable yellow coloration to leather goods.
• Paper Staining: Employed in the production of colored papers, specialty packaging, and decorative paper products.
• Ink Formulation: A component in the manufacture of writing inks, printing inks, and stamp pad inks.
• Biological Staining: Utilized in microscopy and histology as a staining agent for biological tissues.
• Industrial Markers: Suitable for use in non-food industrial markers and colorants.

Basic Information

Product Name	Acid Yellow 7
CAS No.	2391-30-2
Molecular Formula	C16H12N3NaO3S
Molecular Weight	349.34 g/mol
Synonyms	Acid Yellow 7; C.I. 56205; Food Yellow 1; FD&C Yellow No. 1; D&C Yellow No. 7; Trisodium 5-hydroxy-1-(4-sulfonatophenyl)-4-[(E)-(4-sulfonatophenyl)diazenyl]-1H-pyrazole-3-carboxylate; 2-(4-Sulfophenylazo)-1,8-dihydroxy-3,6-naphthalenedisulfonic acid trisodium salt; Lissamine Yellow FF
EINECS	219-234-1

Quality Control

Our Acid Yellow 7 is manufactured under a strict quality management system to ensure batch-to-batch consistency and high performance. Quality is verified through comprehensive testing including identification, assay, and impurity profiling. While this product is typically supplied to industrial grade specifications, we can provide material compliant with relevant colorant purity standards. A Certificate of Analysis (COA) detailing specific test results is available for every batch shipped.

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.

Specification

Item	Specification
Appearance	Yellow to orange-yellow powder
Identification (IR)	Conforms to structure
Assay (HPLC)	Min. 85%
Loss on Drying	Max. 5.0%
Sulfated Ash	Max. 30.0%
Water Solubility	Freely soluble
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.