Description

Acid Green 4 is a synthetic, water-soluble acid dye belonging to the triarylmethane class. This high-purity colorant is valued for its bright, vivid green hue and excellent tinctorial strength, providing reliable and consistent coloration. It is primarily used by manufacturers in the textile, leather, and paper industries for dyeing protein-based fibers like wool, silk, and nylon, as well as for specialty ink formulations.

Application

• Textile Dyeing: Primary application for dyeing wool, silk, and nylon fibers, offering good wash and light fastness.
• Leather Finishing: Used for coloring leather goods, providing uniform and vibrant shades.
• Paper Staining: Employed in the production of colored papers, decorative tissues, and specialty packaging.
• Ink Manufacturing: A key component in formulating inks for ballpoint pens, stamp pads, and other writing instruments.
• Biological Staining: Used in microscopy and histology as a contrast stain in specific laboratory protocols.
• Wood Staining: Applied for tinting and coloring wood surfaces and veneers.
• Soap and Detergent Coloring: Adds color to soaps, detergents, and other cleaning products where acid-stable dyes are required.

Basic Information

Product Name	Acid Green 4
CAS No.	25424-72-0
Molecular Formula	C27H25N2O7S2Na2
Molecular Weight	622.61 g/mol
Synonyms	Acid Green 4; Acid Green G; C.I. 10020; Wool Green S; Lissamine Green B; Food Green 1; FD&C Green No. 1; Green S; E142; Hexacol Green S; Kiton Green S
EINECS	246-991-5

Quality Control

Our Acid Green 4 is manufactured under a strict quality management system to ensure batch-to-batch consistency and high performance. Each lot is tested against stringent in-house specifications for color strength, hue, solubility, and impurity profiles. A comprehensive Certificate of Analysis (COA) detailing purity, heavy metal content, and other critical parameters is provided with every shipment to support your quality assurance protocols.

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). This product is hygroscopic (moisture-sensitive); ensure the container is kept tightly sealed to prevent absorption of atmospheric moisture, which can affect performance.

Specification

Item	Specification
Appearance	Dark green powder or granules
Identification (IR)	Conforms to standard
Color Strength	≥ 98% (vs. Standard)
Moisture Content	≤ 5.0%
Water Solubility	Clear solution
Ash Content (Sulfated)	≤ 30.0%
Heavy Metals (as Pb)	≤ 20 ppm
Arsenic (As)	≤ 3 ppm

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