Description

Acid Brown 357 is a synthetic organic dye belonging to the acid dye class, identified by CAS NO 61814-63-9. This high-performance colorant is valued for its strong affinity for protein fibers like wool, silk, and nylon, delivering excellent wash and light fastness properties. It is a critical component for manufacturers in the textile, leather, and paper industries seeking durable and vibrant brown shades.

Application

• Primary dyeing and printing of wool and silk textiles.
• Coloration of nylon fibers and fabrics.
• Leather finishing for products requiring rich, stable brown tones.
• Specialty paper coloring, including decorative and packaging papers.
• Ink formulation for specific printing applications.
• Blending with other acid dyes to achieve a wide spectrum of brown and earth-tone shades.

Basic Information

Product Name	Acid Brown 357
CAS No.	61814-63-9
Molecular Formula	Contact for details
Molecular Weight	Contact for details
Synonyms	Acid Brown 357; C.I. Acid Brown 357; Brown 357; Acid Leather Brown 357; Acid Dye Brown 357; Nylon Brown 357; Wool Brown 357
EINECS	Contact for details

Quality Control

Our Acid Brown 357 is manufactured under a strict quality management system. Every batch undergoes comprehensive testing for critical parameters including color strength, shade, solubility, and fastness properties to ensure consistent performance and batch-to-batch uniformity. Certificates of Analysis (COA) detailing these specifications are available upon request.

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 incompatible materials.

Specification

Item	Specification
Appearance	Brown Powder
Color Strength	Standard Depth ± 5%
Shade	Conforms to Standard
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 1.0%
Solubility in Water	Conforms
Fastness to Washing	≥ 4-5 (ISO 105-C03)
Fastness to Light	≥ 5 (ISO 105-B02)

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