Description

Acid Black 48 is a synthetic acid dye belonging to the azo dye class, widely recognized for its deep, rich black shade and good fastness properties. It is a critical component for achieving durable and vibrant coloration on protein-based fibers like wool, silk, and leather. This dye is essential for manufacturers in the textile, leather finishing, and specialty paper industries seeking consistent, high-quality black hues. Its reliable performance makes it a staple in formulations requiring excellent leveling and penetration on natural substrates.

Application

• Primary dyeing and printing of wool and silk fabrics and yarns.
• Coloration and finishing of leather goods, including footwear, apparel, and upholstery.
• Dyeing of nylon fibers where acid dye compatibility is required.
• Manufacture of inks for specialized marking and stamping applications.
• Tinting of paper and paper products for aesthetic or functional purposes.
• Used in the formulation of wood stains and other specialty colorants.
• Potential use as a biological stain in laboratory and microscopy settings.

Basic Information

Product Name	Acid Black 48
CAS No.	1328-24-1
Molecular Formula	C22H14N6Na2O9S2
Molecular Weight	616.49 g/mol
Synonyms	Acid Black 48; C.I. 65005; Acid Leather Black NB; Naphthalene Black 12B; Wool Black 2B; Amido Black 10B (related); Acid Black 2; Lissamine Black 12B; Azo Black; Acid Dye Black 48; Sodium 4-amino-5-hydroxy-3-[(4-nitrophenyl)azo]-6-(phenylazo)naphthalene-2,7-disulfonate
EINECS	215-541-0

Quality Control

Our Acid Black 48 is manufactured under a stringent quality management system to ensure batch-to-batch consistency and performance reliability. Each lot is tested against rigorous internal specifications for key parameters including dye content, shade, solubility, and fastness properties. A comprehensive Certificate of Analysis (COA) detailing purity, strength, and impurity profiles is provided with every shipment. We adhere to relevant global standards for industrial dyes, ensuring our product meets the demanding requirements of professional dyers and finishers.

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; prolonged exposure to direct light should be avoided to maintain color integrity.

Specification

Item	Specification
Appearance	Black to Bluish-Black Powder
Identification (IR)	Conforms to Standard
Assay (Dye Content)	≥ 95%
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 1.0%
Shade & Strength	Within 5% of Standard
Solubility in Water	Clear Solution
pH (1% Solution)	6.0 - 8.0

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