Description

C.I. Mordant Brown 90 is a synthetic organic dye belonging to the mordant dye class, identified by CAS No. 8003-58-5. This compound is valued for its ability to form stable, colorfast complexes with metal ions, primarily chromium, resulting in durable brown shades on various substrates. It is an essential material for industries requiring robust and consistent coloration, particularly in textile dyeing and leather finishing. Its performance makes it a key component for manufacturers prioritizing long-lasting, vibrant brown hues.

Application

• Textile Dyeing: Primary application for dyeing wool, silk, and nylon fibers to achieve lightfast and washfast brown colors.
• Leather Finishing: Used in the coloration of leather goods, providing rich, uniform brown tones with good adhesion.
• Wood Staining: Employed to impart decorative brown shades to wood surfaces.
• Paper Coloring: Suitable for specialty paper products requiring specific brown shades.
• Biological Staining: Potential use as a histological stain in laboratory settings.
• Ink Formulation: A component in the manufacture of certain specialty inks and pigments.

Basic Information

Product Name	C.I. Mordant Brown 90
CAS No.	8003-58-5
Molecular Formula	C16H12CrN3NaO8S
Molecular Weight	481.33 g/mol
Synonyms	Mordant Brown 90; Chromium complex of 4-[(2,4-Dihydroxy-5-nitrophenyl)azo]benzenesulfonic acid; Acid Chrome Brown K; C.I. 13205; Chrome Brown K; Acid Mordant Brown 90; Atul Chrome Brown K; Diamond Chrome Brown K
EINECS	Contact for details

Quality Control

Our C.I. Mordant Brown 90 is manufactured under a strict quality management system. Every batch undergoes comprehensive testing for key parameters including color strength, shade, solubility, and metal content to ensure consistent performance and batch-to-batch reproducibility. Certificates of Analysis (COA) documenting these results 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. Due to its light-sensitive nature, prolonged exposure to direct light should be avoided to maintain product integrity.

Specification

Item	Specification
Appearance	Brown powder
Identification (IR)	Conforms
Assay (Dye Content)	Min. 95%
Moisture Content	Max. 5.0%
Water Solubility	Conforms
Shade	Standard
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.