Description

Direct Black 103 is a high-performance, substantive diazo direct dye widely recognized for its deep, intense black shade and excellent build-up properties. It is a critical component for achieving cost-effective and durable coloration on cellulosic fibers like cotton, rayon, and paper. This dye is essential for manufacturers in the textile, leather, and paper industries seeking reliable, consistent black dyeing with good wash and light fastness. Direct Black 103 CAS NO 3071-71-4 is supplied as a high-purity powder to ensure batch-to-batch consistency in demanding industrial applications.

Application

• Primary dyeing and exhaust dyeing of cotton and regenerated cellulose fibers (e.g., viscose, rayon) to produce deep black shades.
• Coloration of paper and paperboard, including specialty papers where a uniform, intense black is required.
• Dyeing of leather, providing a rich black color with good penetration.
• Used in the formulation of inks for specific marking and printing applications.
• Employed in the tinting of soaps and related products.
• Can be used for the coloration of silk and wool under controlled conditions, though it is primarily substantive to cellulose.

Basic Information

Product Name	Direct Black 103
CAS No.	3071-71-4
Molecular Formula	C34H25N9Na2O7S2
Molecular Weight	781.72 g/mol
Synonyms	Direct Black G; C.I. Direct Black 103; Direct Deep Black G; Direct Deep Black GX; Amanil Black G; Atul Direct Black G; Benzo Deep Black G; Diazol Black G; Sirius Black G; Solar Black G
EINECS	221-335-7

Quality Control

Our production of Direct Black 103 adheres to stringent quality management protocols to guarantee product integrity and performance. Every batch is tested against key parameters including color strength, shade, solubility, and fastness properties to ensure it meets the high standards required for industrial dyeing. A comprehensive Certificate of Analysis (COA) detailing purity, physical properties, and performance metrics is provided with each shipment to support your quality assurance processes.

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	Black to Bluish-Black Powder
Identification (IR)	Conforms to Standard
Color Strength	100 ± 3% (Standard)
Shade	Conforms to Standard
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 1.0%
Solubility in Water	Conforms
Fastness Properties (Typical)	Light: 4-5; Wash: 3-4; Water: 3-4

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