Description

Acid Brown 121 is a synthetic acid dye belonging to the azo chemical class, widely recognized for its robust coloring properties. This dye is valued for its ability to produce consistent, deep brown shades with good fastness properties on various substrates. It is primarily utilized by manufacturers in the textile, leather, and paper industries for dyeing and printing applications, where reliable color performance is essential.

Application

• Textile Dyeing: Primary application for dyeing wool, silk, and nylon fibers to achieve durable brown shades.
• Leather Finishing: Used in the coloring of leather goods, providing rich and uniform color penetration.
• Paper Staining: Employed in the production of specialty papers, including decorative and packaging materials.
• Ink Formulation: A component in the manufacture of inks for various marking and printing purposes.
• Wood Staining: Applied to impart color to wood surfaces in furniture and decorative applications.
• Biological Staining (Research Grade): Potential use as a histological stain in laboratory settings for microscopic analysis.

Basic Information

Product Name	Acid Brown 121
CAS No.	6487-04-3
Molecular Formula	C22H14N4Na2O8S2
Molecular Weight	556.48 g/mol
Synonyms	Acid Brown G; C.I. Acid Brown 121; Acid Leather Brown G; Acid Fast Brown G; Brown G (Acid Dye); 2,7-Naphthalenedisulfonic acid, 4-amino-5-hydroxy-3-[(4-nitrophenyl)azo]-6-(phenylazo)-, disodium salt; Acidol Brown M-GL
EINECS	229-356-7

Quality Control

Our Acid Brown 121 is produced under a stringent quality management system to ensure batch-to-batch consistency and performance. Each lot is tested against key parameters including color strength, shade, solubility, and impurity profile. A Certificate of Analysis (COA) detailing these results is provided with every shipment to guarantee compliance with your specifications and industry standards.

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. The product is light-sensitive (store away from light).

Specification

Item	Specification
Appearance	Brown powder or granules
Identification (IR)	Conforms to standard
Assay (Dye Content)	Min. 95%
Moisture Content	Max. 5.0%
Water Insoluble Matter	Max. 0.5%
Shade	Conforms to standard
Solubility in Water	Conforms

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