Description

C.I. Acid Black 61 is a synthetic acid dye belonging to the azo chemical class, widely recognized for its deep, intense black shade and good leveling properties. This dye is valued for its ability to produce consistent, high-quality coloration with excellent fastness on protein fibers like wool, silk, and leather. It is an essential component for manufacturers in the textile, leather finishing, and specialty paper industries seeking reliable and vibrant black dyeing solutions. The compound is supplied under the CAS registry number 12269-79-3.

Application

C.I. Acid Black 61 is primarily utilized in applications requiring durable and vibrant black coloration on nitrogenous substrates. Its key industrial uses include:

• Textile Dyeing: Exhaust and continuous dyeing of wool, silk, and nylon fibers and fabrics.
• Leather Finishing: Dyeing of leather goods, including footwear, apparel, and upholstery, to achieve deep black shades.
• Paper Staining: Coloration of specialty papers, including decorative and security papers.
• Ink Formulation: Used in the manufacture of inks for markers, stamp pads, and other specialty applications.
• Biological Staining: Potential use as a histological stain in laboratory settings.

Basic Information

Product Name	C.I. Acid Black 61
CAS No.	12269-79-3
Molecular Formula	C22H14N6Na2O9S2
Molecular Weight	616.49 g/mol
Synonyms	Acid Black 61; C.I. 15710; Acid Leather Black NB; Acid Black NB; Acid Fast Black NB; Acidol Black NB; Amido Black NB; Dermacid Black NB; Lissamine Black NB; Supranol Fast Black NB; Telon Fast Black NB
EINECS	235-525-8

Quality Control

Our production of C.I. Acid Black 61 adheres to stringent quality management protocols to ensure batch-to-batch consistency and performance reliability. Each lot is analyzed for critical parameters including dye content, shade, solubility, and fastness properties. A comprehensive Certificate of Analysis (COA) detailing purity, strength, and conformance to agreed specifications is provided with every shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at ambient temperature (15-25°C). Keep away from strong oxidizing agents. The original container should be kept sealed when not in use to minimize moisture absorption and contamination.

Specification

Item	Specification
Appearance	Black powder or granules
Identification (IR)	Conforms to standard
Assay (Dye Content)	≥ 95%
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 1.0%
Shade	Conforms to standard
Solubility in Water	Conforms
Fastness Properties (Typical)	Light: 4-5; Wash: 4-5; Perspiration: 4

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