Description

Acidblack50 CAS NO 12217-15-1 is a high-performance, synthetic acid dye belonging to the azo dye class, valued for its deep, intense black coloration and excellent affinity for protein-based fibers. It is a critical component for achieving durable, wash-fast black shades in demanding industrial dyeing processes. This product is essential for manufacturers in the textile, leather, and paper industries seeking reliable and consistent black dyeing solutions.

Application

• Textile Dyeing: Primary application for dyeing wool, silk, and nylon to achieve deep black shades with good fastness properties.
• Leather Processing: Used in the dyeing of leather goods, providing rich, uniform black color for footwear, apparel, and upholstery.
• Paper Coloration: Employed in specialty paper production where a deep black hue is required.
• Ink Formulation: Serves as a colorant in the manufacture of certain inks, particularly for industrial marking.
• Biological Staining: Potential use as a histological stain in laboratory settings, though specific grades must be verified.

Basic Information

Product Name	Acidblack50
CAS No.	12217-15-1
Molecular Formula	C22H14N6Na2O9S2
Molecular Weight	616.49 g/mol
Synonyms	Acid Black 50; C.I. 20470; Sodium 4-amino-5-hydroxy-3-[(4-nitrophenyl)azo]-6-(phenylazo)naphthalene-2,7-disulphonate; Acid Leather Black NB; Naphthalene Black 12B; Amido Black 10B (related); Azo Black; Acid Black NB
EINECS	235-414-6

Quality Control

Our Acidblack50 is manufactured under a stringent quality management system to ensure batch-to-batch consistency and performance reliability. Each lot is tested against key parameters including color strength, shade, solubility, and impurity profiles to meet industrial dye standards. Certificates of Analysis (COA) documenting purity, physical properties, and performance characteristics are available upon request 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). Keep away from strong oxidizing agents. The product is light-sensitive (store away from light).

Specification

Item	Specification
Appearance	Black to dark bluish-black powder
Identification (IR)	Conforms to standard
Assay (Dye Content)	≥ 95%
Moisture Content	≤ 5.0%
Water Solubility	Freely soluble
Ash Content	≤ 1.0%
pH (1% Solution)	6.0 - 8.0
Heavy Metals (as Pb)	≤ 20 ppm

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