Description

Direct Black M, Tardirect Black M CAS NO 6897-38-7 is a high-performance, substantive azo dye belonging to the direct dye class, valued for its deep, rich black shade and excellent build-up properties on cellulosic fibers. Its primary commercial significance lies in providing a cost-effective and reliable coloring solution with good wet fastness for large-scale textile dyeing and printing operations. This product is essential for manufacturers in the textile industry, particularly for dyeing cotton, viscose, and paper, where consistent color strength and batch-to-batch uniformity are critical for quality assurance.

Application

• Textile Dyeing: Primary application for dyeing cotton, viscose, rayon, and other cellulosic fibers to achieve a deep black shade.
• Paper Coloring: Used in the production of colored papers, including specialty packaging and decorative papers.
• Leather Finishing: Employed in the dyeing of leather goods to provide a uniform and durable black color.
• Ink Formulation: A key component in the manufacture of certain types of inks, including those for flexographic and gravure printing.
• Wood Staining: Applicable for staining wood and wood-based products to impart a dark finish.
• Biological Staining (Histology): May be used in specific laboratory staining protocols as a biological stain.

Basic Information

Product Name	Direct Black M, Tardirect Black M
CAS No.	6897-38-7
Molecular Formula	C34H25N9Na2O7S2
Molecular Weight	781.72 g/mol
Synonyms	Direct Black M; Direct Black MR; C.I. Direct Black 38; Direct Deep Black EW; Direct Black EX; Atul Direct Black M; Amanil Black MR; Benzo Deep Black E; Pyrazol Black MFD; Pontamine Black E; Chlorazol Black E; Columbia Black MR
EINECS	229-999-3

Quality Control

Our Direct Black M is manufactured under a stringent quality management system to ensure it meets the high standards required for industrial applications. Every batch is tested for critical parameters including color strength, shade, solubility, and impurity profile to guarantee consistent performance and reliable results in your process. A comprehensive Certificate of Analysis (COA) detailing all test results is provided with each shipment to support your quality assurance protocols.

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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed when not in use to prevent absorption of atmospheric moisture, which can affect product performance. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Black to Bluish-Black Powder
Identification (IR)	Conforms
Color Strength	100 ± 3% (Standard)
Shade	Conforms to Standard
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 1.0%
Solubility in Water	Conforms
pH (1% Solution)	6.0 - 8.0
Fastness Properties	To be specified per grade

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