Description

C.I.Direct Green 66 is a synthetic direct dye belonging to the azo chemical class, identified by CAS No. 61724-86-5. It is valued for its strong affinity to cellulosic fibers like cotton and viscose, providing deep, substantive green shades with good wash fastness. This product is essential for textile manufacturers, paper colorists, and leather tanneries seeking efficient and cost-effective dyeing solutions for bulk materials.

Application

• Textile Dyeing: Primary application for exhaust and continuous dyeing of cotton, viscose rayon, and other cellulosic fibers.
• Paper Coloring: Used in the mass coloration of paper and paperboard to achieve uniform green hues.
• Leather Finishing: Imparts color to leather goods, including footwear, bags, and upholstery.
• Ink Formulation: Serves as a colorant for certain types of inks and toners.
• Biological Staining: Potential use as a histological stain in laboratory settings.
• Craft and Specialty Dyes: Suitable for batik, tie-dye, and other craft dyeing applications.

Basic Information

Product Name	C.I. Direct Green 66
CAS No.	61724-86-5
Molecular Formula	C40H23N7Na4O16S4
Molecular Weight	1161.88 g/mol
Synonyms	Direct Green 66; C.I. 34025; Direct Green B; Direct Green GS; Direct Dark Green B; Direct Green 66 (C.I. 34025); Benzo Dark Green B; Pontamine Green B; Sirius Green B; Aizen Direct Green BH; Atlantic Direct Green B; Durazol Green B; Solophenyl Green BLE
EINECS	262-947-6

Quality Control

Our C.I. Direct Green 66 is manufactured under a strict quality management system. Every batch undergoes rigorous testing for key parameters including color strength, shade, solubility, and impurity profile to ensure consistency and performance. A Certificate of Analysis (COA) detailing purity, physical properties, and conformance to specification is provided with each 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). Keep away from heat sources and incompatible materials. Due to its light-sensitive nature, prolonged exposure to direct light should be avoided to maintain product integrity.

Specification

Item	Specification
Appearance	Dark green to black powder
Identification (IR)	Conforms to standard
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 1.0%
Shade	Conforms to standard
Solubility in Water	Conforms
pH (1% Solution)	6.0 - 8.0

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