Description

Acid Brown 283 is a synthetic organic dye belonging to the acid dye class, widely recognized for its application in textile coloration. This product is valued for its ability to provide consistent, vibrant brown shades with good fastness properties on protein fibers like wool, silk, and nylon. It is a critical component for dye houses and chemical suppliers serving the global textile, leather, and specialty paper industries. The compound is supplied as a high-purity powder to ensure reliable performance in demanding industrial processes.

Application

• Primary dyeing of wool, silk, and nylon textiles to achieve brown hues.
• Leather finishing and coloration for upholstery, garments, and accessories.
• Coloration of paper products, including specialty and decorative papers.
• As a colorant in the manufacture of inks and toners.
• Used in the staining and identification of biological specimens in laboratory settings.
• Potential use as a tracer or marker in industrial fluid systems.

Basic Information

Product Name	Acid Brown 283
CAS No.	12219-66-8
Molecular Formula	C32H24N8Na4O16S4
Molecular Weight	1048.88 g/mol
Synonyms	Acid Brown G; C.I. Acid Brown 283; Acid Leather Brown G; Acid Fast Brown G; Brown 283; Acid Brown 283 (C.I. 202525); Sodium 4-[[4-[[2,4-diamino-5-[(4-sulfophenyl)azo]phenyl]azo]-1-naphthyl]azo]-5-hydroxy-6-(phenylazo)naphthalene-2,7-disulfonate
EINECS	Contact for details

Quality Control

Our Acid Brown 283 is manufactured under a strict quality management system. Each batch undergoes comprehensive analysis to ensure it meets precise color strength, shade, and purity specifications. Key parameters including assay, solubility, and fastness properties are verified. A Certificate of Analysis (COA) documenting these results is provided with every shipment to guarantee consistency and performance for your application.

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 to dark brown powder
Identification (IR)	Conforms to standard
Assay (HPLC)	Min. 95%
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	Max. 5.0%
Water Solubility	Conforms
Ash Content	Max. 1.0%
Heavy Metals (as Pb)	Max. 20 ppm

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