Description

Fast Green CAS NO 12777-77-4 is a synthetic, water-soluble triarylmethane dye widely recognized for its brilliant green color and high tinctorial strength. This product is valued for its stability and versatility as a colorant in a range of industrial and research applications. It is primarily utilized by manufacturers in the biological staining, food colorant, and cosmetic sectors, where precise and reliable coloration is critical.

Application

• Biological Staining Agent: Used in microscopy for staining collagen, cartilage, and as a counterstain in various histological procedures.
• Food Colorant (where permitted): Imparts a stable green color to beverages, confectionery, and other food products.
• Cosmetic and Personal Care: Employed as a color additive in soaps, shampoos, and other cosmetic formulations.
• Textile Dyeing: Acts as a colorant for silk, wool, and nylon fabrics.
• Ink and Paper Manufacturing: Provides coloration for specialty inks and colored paper products.
• Laboratory Research: Serves as a tracer dye and analytical reagent in biochemical and pharmaceutical research.

Basic Information

Product Name	Fast Green
CAS No.	12777-77-4
Molecular Formula	C37H34N2O10S3Na2
Molecular Weight	808.86 g/mol
Synonyms	Fast Green FCF; Food Green 3; CI 42053; FD&C Green No. 3; Acid Green 50; Lissamine Green B; Wool Green S; Green 1724; Green No. 204
EINECS	235-824-3

Quality Control

Our Fast Green is manufactured under a strict quality management system. Each batch is tested to ensure it meets specifications for identity, purity, and color strength, with compliance to relevant standards such as FCC (Food Chemicals Codex) for food-grade applications. A comprehensive Certificate of Analysis (COA) documenting all test results is provided with every 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 incompatible materials.

Specification

Item	Specification
Appearance	Dark green powder or granules
Identification (UV-Vis)	Conforms
Assay (Color Content)	≥ 85%
Loss on Drying	≤ 15.0%
Water Insoluble Matter	≤ 0.2%
Subsidiary Colors	Passes test
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.