Description

Acid Black 139 is a high-performance, synthetic azo dye belonging to the acid dye class, widely recognized for its deep, rich black shade and excellent fastness properties. It is a critical component for achieving durable and vibrant coloration on protein-based fibers like wool, silk, and nylon, as well as in leather finishing. This dye is essential for manufacturers in the textile, leather, and specialty paper industries seeking reliable, consistent, and high-quality black coloration. Its formulation ensures strong affinity for substrates, resulting in superior wash and light fastness for end products.

Application

• Primary dyeing and printing of wool and silk fabrics and yarns.
• Coloration of nylon fibers for apparel, carpets, and technical textiles.
• Leather finishing for footwear, upholstery, and accessories, providing a deep black color.
• Dyeing of blended fabrics containing protein fibers or polyamide components.
• Specialty applications in the coloration of paper and feathers.
• Used in combination with other acid dyes to achieve specific shade depths and tonalities.

Basic Information

Product Name	Acid Black 139
CAS No.	61723-89-5
Molecular Formula	C40H23N7Na4O13S4
Molecular Weight	1083.88 g/mol
Synonyms	Acid Black WAN; C.I. Acid Black 139; Acid Black NT; Lanasyn Black S-BL; Telon Black ACR; Nylosan Black N-BL; Acid Leather Black NT; Aminyl Black F-BL
EINECS	Contact for details

Quality Control

Every batch of Acid Black 139 is manufactured and tested under a strict quality management system to ensure consistent shade, strength, and application performance. Our quality control protocols include verification of key parameters such as color strength, solubility, shade, and fastness properties against established industrial standards. Certificates of Analysis (COA) detailing batch-specific results are provided 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). This product is hygroscopic (moisture-sensitive); keep the container tightly sealed when not in use to prevent absorption of atmospheric moisture, which can affect performance.

Specification

Item	Specification
Appearance	Black to bluish-black powder
Identification (IR)	Conforms to standard
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 0.5%
Shade	Conforms to standard
Solubility in Water	Conforms
Fastness Properties (Typical)	Wash: 4-5; Light: 5-6

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