Description

C.I. Direct Green 31 is a synthetic, substantive direct dye belonging to the azo chemical class, identified by CAS No. 12222-31-0. It is valued for its strong affinity to cellulosic fibers like cotton and rayon, providing good wash-fastness and level dyeing properties. This dye is essential for manufacturers in the textile and paper industries seeking efficient, cost-effective coloring solutions for bulk materials.

Application

• Textile Dyeing: Primary application for dyeing cotton, viscose rayon, and other cellulosic fibers in exhaust and continuous dyeing processes.
• Paper Coloring: Used for tinting and dyeing paper pulp, tissue, and specialty papers to achieve uniform green shades.
• Leather Finishing: Employed in the dyeing of leather goods where direct dye penetration is required.
• Ink Formulation: Serves as a colorant in the manufacture of certain inks and coatings.
• Biological Staining: Potential use as a histological stain in laboratory settings due to its specific affinity.

Basic Information

Product Name	C.I. Direct Green 31
CAS No.	12222-31-0
Molecular Formula	C34H23N9Na4O16S4
Molecular Weight	1085.89 g/mol
Synonyms	Direct Green 31; Direct Green B; C.I. 36290; Direct Green 31 (C.I. 36290); Direct Green BN; Direct Green G; Direct Green SE; Pontamine Green BX; Aizen Direct Green BH; Atul Direct Green G; Benzo Green G; Chlorantine Green BLL; Diazol Green G; Sirius Green G
EINECS	Contact for details

Quality Control

Our C.I. Direct Green 31 is manufactured under a strict quality management system. Each batch is tested to ensure consistent strength, shade, and solubility, meeting typical commercial dye specifications. A Certificate of Analysis (COA) detailing purity, physical properties, and performance characteristics is provided with every shipment to guarantee traceability and compliance.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from strong oxidizing agents. The product is hygroscopic (moisture-sensitive); ensure containers are sealed after use to prevent moisture absorption and caking.

Specification

Item	Specification
Appearance	Dark green to black powder or granules
Identification	Conforms (IR / HPLC)
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.