Description

Acid Blue 40 is a synthetic, water-soluble acid dye belonging to the anthraquinone class, known for its bright and stable blue color. It is valued for its excellent lightfastness and washfastness properties, making it a reliable choice for demanding coloration applications. This dye is primarily used in the textile industry for dyeing protein fibers like wool and silk, as well as in the coloration of leather, paper, and certain specialty inks.

Application

• Primary dyeing of wool, silk, and other protein-based natural fibers.
• Coloration of leather goods, including footwear, apparel, and upholstery.
• Production of colored paper and paperboard for packaging and decorative purposes.
• Manufacturing of writing inks, stamp pad inks, and other specialty inks.
• Dyeing of nylon fibers where good wetfastness is required.
• As a colorant for food packaging materials (subject to regional regulatory compliance).
• Used in biological staining applications for microscopy.
• Potential use as a tracer dye in industrial and environmental studies.

Basic Information

Product Name	Acid Blue 40
CAS No.	6424-85-7
Molecular Formula	C20H13N2NaO5S
Molecular Weight	416.38 g/mol
Synonyms	Acid Blue 40; C.I. 62125; Acid Blue AS; Eriosin Blue A-G; Wool Blue AS; Anthraquinone Blue; Sodium 1-amino-4-(cyclohexylamino)-9,10-dioxo-9,10-dihydroanthracene-2-sulfonate; Acid Leather Blue A2G
EINECS	229-178-6

Quality Control

Our Acid Blue 40 is manufactured under a strict quality management system to ensure batch-to-batch consistency and performance. Each lot is tested against stringent internal specifications for critical parameters including color strength, shade, solubility, and impurity profile. A comprehensive Certificate of Analysis (COA) detailing purity, physical properties, and performance tests is provided with every shipment to guarantee it meets your application requirements.

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 incompatible materials. The product is light-sensitive (store away from light).

Specification

Item	Specification
Appearance	Dark blue powder or granules
Identification (IR)	Conforms to standard
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 0.5%
Ash Content	≤ 1.0%
pH (1% Solution)	6.0 - 8.0
Heavy Metals (as Pb)	≤ 20 ppm

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