Description

C.I. Acid Brown 47 is a synthetic acid dye belonging to the azo dye class, valued for its consistent color strength and good fastness properties. This dye is engineered to provide reliable and uniform coloration, which is critical for maintaining product quality and brand consistency in demanding industrial applications. It is primarily utilized by manufacturers in the textile, leather, and paper industries for dyeing natural fibers like wool, silk, and nylon, as well as for specialty applications requiring a stable brown hue.

Application

• Textile Dyeing: Primary application for dyeing wool, silk, and nylon fibers to achieve various shades of brown.
• Leather Finishing: Used in the coloration of leather goods, including footwear, apparel, and upholstery.
• Paper Staining: Employed for tinting paper products, specialty papers, and packaging materials.
• Ink Formulation: A colorant component in the manufacture of inks for specific printing applications.
• Wood Staining: Used in stains for wood and other porous materials to provide a decorative brown finish.
• Biological Staining (Histology): Potential use as a stain in microscopic analysis for biological tissues, depending on the purity grade.

Basic Information

Product Name	C.I. Acid Brown 47
CAS No.	12768-77-3
Molecular Formula	C16H12N4Na2O7S2
Molecular Weight	502.39 g/mol
Synonyms	Acid Brown 47; C.I. 20185; Acid Leather Brown 2GL; Acid Fast Brown 2GL; Acidol Brown M-2GL; Amido Brown 2GL; Azo Leather Brown 2GL; Leather Brown 2GL; Sodium 4-hydroxy-3-[(2-hydroxy-1-naphthyl)azo]naphthalene-1-sulfonate
EINECS	Contact for details

Quality Control

Our C.I. Acid Brown 47 is produced under a stringent quality management system to ensure batch-to-batch consistency and performance. Each lot is tested against rigorous specifications for color value, strength, solubility, and impurity profiles. We provide comprehensive Certificates of Analysis (COA) with each shipment, detailing all relevant quality parameters to support your compliance and production 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). Keep away from strong oxidizing agents. The product is light-sensitive (store away from light).

Specification

Item	Specification
Appearance	Brown powder or granules
Identification (IR)	Conforms to standard
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 1.0%
Ash Content	≤ 30.0%
pH (1% Solution)	6.0 - 8.0
Heavy Metals (as Pb)	≤ 20 ppm

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