Description

Basic Brown 4 is a synthetic organic dye belonging to the azo class, identified by CAS No. 104744-50-5. This high-purity colorant is valued for its consistent shade and performance in demanding industrial applications. It is primarily utilized by manufacturers in the textile, leather, and specialty paper industries seeking reliable and vibrant brown coloration.

Application

• Textile Dyeing: Used for dyeing natural and synthetic fibers, including cotton, wool, and polyamide blends.
• Leather Finishing: Applied in the coloring of leather goods such as footwear, bags, and upholstery.
• Paper Coloring: Employed in the production of specialty papers, including decorative and packaging materials.
• Wood Staining: Used as a colorant in stains and finishes for wood products.
• Ink Formulation: A component in the manufacture of inks for various printing applications.
• Biological Staining (Research Grade): May be used in histological staining for microscopy in laboratory settings.

Basic Information

Product Name	Basic Brown 4
CAS No.	104744-50-5
Molecular Formula	C21H24N8
Molecular Weight	388.47 g/mol
Synonyms	Basic Brown 4; Bismarck Brown Y; C.I. 21000; Vesuvin; Phenylene Brown; Manchester Brown; Basic Brown G; C.I. Basic Brown 1
EINECS	Contact for details

Quality Control

Our Basic Brown 4 is produced under a rigorous quality management system. Each batch is tested to ensure it meets precise specifications for color strength, hue, and purity. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profile, and physical parameters is available upon request to support your quality assurance protocols.

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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Brown to dark brown powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Water Solubility	Completely soluble
Heavy Metals (as Pb)	≤ 20 ppm
Ash Content	≤ 1.0%

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