Description

Acid Brown 4 is a synthetic organic dye belonging to the azo dye class, identified by the CAS registry number 5858-51-5. This high-purity colorant is valued for its consistent shade, strong affinity, and excellent fastness properties in demanding industrial applications. It is primarily utilized by manufacturers in the textile, leather, and paper industries seeking reliable and vibrant brown coloration.

Application

• Textile Dyeing: Primary application for dyeing wool, silk, and nylon fibers to achieve a durable brown shade.
• Leather Finishing: Used in the staining and coloring of leather goods, providing uniform and deep color penetration.
• Paper Coloration: Employed in the production of specialty papers, including decorative and packaging materials.
• Ink Formulation: A key component in the manufacture of inks for various printing applications.
• Biological Staining: Potential use as a histological stain in laboratory settings (subject to specific grade purity).
• Wood Staining: Applied in stains for wood and related materials to enhance aesthetic appeal.

Basic Information

Product Name	Acid Brown 4
CAS No.	5858-51-5
Molecular Formula	C22H14N6Na2O9S2
Molecular Weight	624.49 g/mol
Synonyms	Acid Brown 4; C.I. Acid Brown 4; C.I. 14805; Acid Leather Brown D; Acid Fast Brown G; Brown 4G; Acidol Brown M-BL; Amido Brown 4G; Azo Leather Brown D; Acid Leather Brown 4G
EINECS	227-476-2

Quality Control

Our Acid Brown 4 is manufactured under a stringent quality management system. Every batch undergoes comprehensive analytical testing, including assay, identification, and impurity profiling, to ensure it meets precise specifications for industrial dye applications. A Certificate of Analysis (COA) detailing purity, strength, and conformance is provided with each 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). This material is hygroscopic (moisture-sensitive); ensure the container is kept tightly sealed when not in use to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Brown powder or granules
Identification (IR)	Conforms to standard
Assay (HPLC)	Min. 95%
Moisture Content	Max. 5.0%
Water Insoluble Matter	Max. 0.5%
Shade & Strength	Within agreed commercial tolerance

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