Description

C.I.Direct Black 149 is a high-performance direct dye belonging to the benzidine-derived azo dye class. This compound is valued for its excellent substantivity to cellulosic fibers, providing deep, level shades with good wash fastness. It is primarily utilized in the textile industry for dyeing and printing applications on cotton, viscose, and other regenerated fibers. The product is supplied as a fine powder, ensuring ease of dissolution and consistent batch-to-batch performance for industrial users.

Application

• Textile Dyeing: Primary application for dyeing cotton, rayon, and other cellulosic fabrics to achieve deep black shades.
• Paper Coloring: Used in the tinting and surface coloring of paper and paperboard products.
• Leather Finishing: Employed in the dyeing of leather goods to provide uniform and durable color.
• Ink Formulation: A colorant component in the manufacture of certain types of inks, including stamp pad and flexographic inks.
• Biological Staining: May be used as a histological stain in laboratory settings for microscopic examination.
• Industrial Coatings: Incorporated into coatings and finishes where a deep black pigment is required.

Basic Information

Product Name	C.I. Direct Black 149
CAS No.	61968-19-2
Molecular Formula	C34H25N9Na2O7S2
Molecular Weight	781.72 g/mol
Synonyms	Direct Black 149; C.I. 31790; Direct Deep Black EW; Pontamine Black EWN; Sirius Black VSG; Aizen Direct Deep Black BH; Atul Direct Black D; Benzo Deep Black EWN; Chloramine Fast Black E; Diazol Black 2V; Dinamine Black V; Direct Black EX; Direct Black G; Direct Black VS; Kayaku Direct Deep Black BH; Pyrazol Black NB
EINECS	263-387-2

Quality Control

Our production of C.I. Direct Black 149 adheres to stringent quality management protocols to ensure product consistency and performance. Each batch is tested against established specifications for critical parameters including dye content, shade, solubility, and fastness properties. A comprehensive Certificate of Analysis (COA) detailing these results is provided with every shipment to guarantee traceability and compliance with customer requirements.

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
Dye Content	≥ 95%
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 1.0%
Shade	Standard
Solubility in Water	Conforms
Fastness to Washing	≥ 4-5 (ISO 105-C03)
Fastness to Light	≥ 5 (ISO 105-B02)

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