Description

Acid Black 131 is a synthetic, high-performance acid dye belonging to the azo chemical class, valued for its deep, rich black shade and excellent colorfastness properties. This dye is engineered to deliver consistent, vibrant coloration with strong affinity for protein-based fibers like wool, silk, and nylon. It is an essential component for manufacturers in the textile, leather, and paper industries seeking reliable and durable black dyeing solutions. The compound is identified by the CAS registry number 12219-01-1.

Application

Acid Black 131 is primarily utilized for dyeing and printing applications where a robust black color is required. Its key applications include:

• Textile Dyeing: Primary use for dyeing wool, silk, and nylon fibers and fabrics.
• Leather Processing: Used for dyeing leather goods, providing deep penetration and good fastness.
• Paper Coloration: Employed in specialty paper production for achieving black tones.
• Ink Formulation: A component in the manufacture of certain inks and toners.
• Biomaterial Staining: Potential use in laboratory staining protocols for biological tissues.

Basic Information

Product Name	Acid Black 131
CAS No.	12219-01-1
Molecular Formula	C22H14N6Na2O9S2
Molecular Weight	616.49 g/mol
Synonyms	Acid Black WAN; C.I. Acid Black 131; Acid Black NBG; Acid Black SR; Black 131; Acid Leather Black NBG; 2,7-Naphthalenedisulfonic acid, 4-amino-5-hydroxy-3-[(4-nitrophenyl)azo]-6-(phenylazo)-, disodium salt; Acid Black 2B
EINECS	Contact for details

Quality Control

Our production of Acid Black 131 adheres to stringent quality management protocols to ensure batch-to-batch consistency and performance reliability. The product is manufactured under controlled conditions and undergoes comprehensive analytical testing, including spectrophotometric analysis for strength and shade, and chromatography for purity. A Certificate of Analysis (COA) detailing specific lot parameters is provided with every shipment to guarantee compliance with your technical requirements.

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 and incompatible materials. For long-term storage, maintain low humidity conditions to prevent caking.

Specification

Item	Specification
Appearance	Black to Bluish-Black Powder
Identification (IR)	Conforms to Standard
Color Strength	100 ± 3% (vs. Standard)
Shade	Conforms to Standard
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 1.0%
pH (1% Solution)	6.0 - 8.0
Fastness Properties	To be specified per grade

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