Description

Acid Brown 33 is a synthetic acid dye belonging to the azo dye class, widely recognized for its robust coloring properties and good lightfastness. This dye is valued for its ability to produce consistent, deep brown shades on protein fibers like wool, silk, and leather, as well as on polyamide fibers. It is a critical component for manufacturers in the textile, leather finishing, and paper industries seeking durable and vibrant coloration. Our supply of Acid Brown 33 CAS NO 12269-85-1 is backed by stringent quality control to ensure batch-to-batch consistency for industrial applications.

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, providing rich and uniform brown tones.
• Paper Staining: Employed in the production of specialty colored papers and paper products.
• Ink Formulation: A component in the manufacture of inks for specific marking and printing applications.
• Biological Staining: May be used in histological stains for microscopy in laboratory settings.
• Wood Staining: Applied in formulations for staining wood to enhance its aesthetic appeal.

Basic Information

Product Name	Acid Brown 33
CAS No.	12269-85-1
Molecular Formula	C22H14N6Na2O9S2
Molecular Weight	624.49 g/mol
Synonyms	Acid Brown G; C.I. Acid Brown 33; Acid Leather Brown G; Acid Fast Brown G; Brown Acid G; Acidol Brown M-GL; Amido Brown G; Dermina Brown G; Lissamine Brown G; Supranol Brown G; Telon Brown G (Various trade names may apply)
EINECS	235-543-8

Quality Control

Our Acid Brown 33 is manufactured under a strict quality management system. Each batch is tested to ensure it meets high-purity standards and consistent dyeing performance. Key parameters such as color strength, shade, solubility, and impurity profiles are rigorously verified. A Certificate of Analysis (COA) detailing all test results is provided with every shipment to guarantee traceability and compliance with your specifications.

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
Assay (Color Strength)	≥ 98%
Moisture Content	≤ 5.0%
Water Solubility	Conforms
pH (1% Solution)	6.0 - 8.0
Ash Content	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm

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