Description

C.I. Acid Blue 281 is a synthetic acid dye belonging to the anthraquinone chemical class, valued for its bright and stable blue hue. This high-performance colorant is engineered to deliver excellent color fastness and compatibility in demanding industrial applications. It is primarily used by manufacturers in the textile, leather, and specialty paper industries seeking reliable and consistent dyeing results.

Application

• Textile Dyeing: Primary application for dyeing polyamide (nylon) fibers, wool, and silk, offering good wet fastness properties.
• Leather Finishing: Used for coloring leather goods, providing vibrant and uniform shades.
• Paper Coloration: Employed in the production of specialty and decorative papers.
• Ink Formulation: A colorant component in the manufacture of certain inks and toners.
• Biological Staining: Potential use as a histological stain in laboratory settings.

Basic Information

Product Name	C.I. Acid Blue 281
CAS No.	226923-51-9
Molecular Formula	C32H26N4Na2O8S2
Molecular Weight	696.66 g/mol
Synonyms	Acid Blue 281; Acid Blue A; C.I. 621511; Anthraquinone Blue A; Sodium 1-amino-4-[(4-aminophenyl)amino]-9,10-dihydro-9,10-dioxo-2-anthracenesulfonate; Acid Leather Blue A; Nylosan Blue N-BL; Telon Blue ANL
EINECS	Contact for details

Quality Control

Our C.I. Acid Blue 281 is produced under a strict quality management system. Each batch undergoes comprehensive analytical testing, including identification, purity assay, and strength evaluation, to ensure it meets consistent performance standards for industrial dyeing. A Certificate of Analysis (COA) detailing specific batch results 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 room temperature (15-25°C). This product is hygroscopic (moisture-sensitive) and light-sensitive; containers must be kept tightly sealed after opening to prevent moisture absorption and color degradation.

Specification

Item	Specification
Appearance	Dark blue powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95.0%
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 0.5%
Shade	Conforms to standard
Fastness Properties	Contact for details

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