Description

n-[4-[(4-Amino-3-Sulfonato-6-Sodiosulfo-1-Naphthalenyl)[4-(Diethylamino)Phenyl]Methylene]-2,5-Cyclohexadien-1-Ylidene]-n-Ethylethanaminium is a high-purity, water-soluble anionic dye belonging to the triarylmethane class, known for its intense color and excellent substantivity. This compound is valued for its strong chromophore and functional sulfonate groups, which provide superior binding affinity to various substrates. It is primarily utilized by manufacturers in the textile, paper, and specialty ink industries seeking reliable and consistent colorants for demanding applications.

Application

• Textile Dyeing: As a key dye for coloring wool, silk, and polyamide fibers, offering good lightfastness and wash fastness.
• Paper Coloring: Used in the production of high-quality colored papers, including security papers and decorative packaging.
• Ink Formulation: A critical component in the manufacture of specialty inks for flexographic, gravure, and inkjet printing.
• Biological Staining: Employed as a histological stain in laboratory settings for microscopic analysis of tissues.
• Leather Finishing: Provides vibrant and durable coloration in the finishing processes for leather goods.
• Indicator Chemistry: Can be used in the synthesis of pH-sensitive indicators and sensors due to its distinct color change properties.

Basic Information

Product Name	n-[4-[(4-Amino-3-Sulfonato-6-Sodiosulfo-1-Naphthalenyl)[4-(Diethylamino)Phenyl]Methylene]-2,5-Cyclohexadien-1-Ylidene]-n-Ethylethanaminium
CAS No.	6391-41-9
Molecular Formula	C31H33N3O6S2Na
Molecular Weight	639.73 g/mol
Synonyms	Acid Blue 90; C.I. 42655; Wool Blue S; Naphthol Blue Black; Acid Blue AS; C.I. Acid Blue 90; Sodium 4-[(4-diethylaminophenyl)-(4-imino-3-sulfo-6-sulfonatonaphthalen-1-ylidene)methyl]diethylammonium; 1-Naphthalenesulfonic acid, 4-[(4-(diethylamino)phenyl][4-(ethylamino)-1-naphthalenyl]methylene]-2,5-cyclohexadien-1-ylidene]diethylammonium hydroxide, inner salt, sodium salt
EINECS	228-995-4

Quality Control

Our n-[4-[(4-Amino-3-Sulfonato-6-Sodiosulfo-1-Naphthalenyl)[4-(Diethylamino)Phenyl]Methylene]-2,5-Cyclohexadien-1-Ylidene]-n-Ethylethanaminium is produced under a strict quality management system. Every batch undergoes rigorous analytical testing, including HPLC for purity and spectrophotometry for color strength, to ensure it meets precise specifications for industrial dye applications. Certificates of Analysis (COA) detailing purity, impurity profile, and physical parameters are provided with each shipment to guarantee batch-to-batch consistency and compliance.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after each use to prevent absorption of atmospheric moisture, which can affect product performance and handling.

Specification

Item	Specification
Appearance	Dark blue to black powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Color Strength	98 - 102% (vs. Standard)
Loss on Drying	≤ 5.0%
Sulfated Ash	≤ 20.0%
Water Solubility	Completely soluble

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