Description

Acid Blue 221 is a synthetic, water-soluble acid dye belonging to the anthraquinone chemical class, valued for its bright and stable blue hue. Its primary commercial value lies in its excellent lightfastness, wash fastness, and strong affinity for protein-based fibers like wool, silk, and nylon. This dye is essential for manufacturers in the textile, leather, and paper industries seeking vibrant, durable coloration for their products. The compound is also identified by the CAS registry number 12219-32-8.

Application

Acid Blue 221 is a versatile colorant used across several industrial sectors. Its key applications include:

• Textile Dyeing: Primary application for dyeing wool, silk, nylon, and modified acrylic fibers to achieve brilliant blue shades.
• Leather Finishing: Used for coloring leather goods, providing rich color with good penetration and rub fastness.
• Paper Coloring: Employed in the production of specialty papers, including decorative and packaging materials.
• Ink Formulation: A component in the manufacture of inks for pens, stamp pads, and other specialty applications.
• Biological Staining: Potential use as a histological stain in laboratory settings due to its affinity for specific tissues.

Basic Information

Product Name	Acid Blue 221
CAS No.	12219-32-8
Molecular Formula	C32H26N4Na2O8S2
Molecular Weight	704.66 g/mol
Synonyms	Acid Blue ARL; C.I. Acid Blue 221; Acid Blue A-RL; Acid Leather Blue ARL; Telon Blue ARL; Nylosan Blue N-5GL; Lanasyn Blue S-BGL; Anthraquinone Blue ARL; Sodium 1-amino-4-[(4-aminophenyl)amino]-9,10-dioxo-9,10-dihydroanthracene-2-sulfonate
EINECS	Contact for details

Quality Control

Our production of Acid Blue 221 adheres to stringent quality management protocols to ensure batch-to-batch consistency and performance reliability. Every lot is tested against key parameters including color strength, shade, solubility, and impurity profile. Certificates of Analysis (COA) documenting purity, physical properties, and conformance to agreed specifications are provided with each shipment and are available upon request.

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	Dark Blue Powder
Identification (IR)	Conforms to Standard
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 1.0%
pH (1% Solution)	6.0 - 8.0
Shade	Conforms to Standard
Fastness Properties (Typical)	Light: 5-6; Wash: 4-5

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