Description

Fluorescein (Solvent Yellow 94) is a high-purity, synthetic organic dye belonging to the xanthene class, known for its intense fluorescence and excellent solubility in organic solvents. This compound is valued for its ability to impart a brilliant yellow color and its utility as a tracer and marker in various industrial and analytical processes. It is an essential material for manufacturers and formulators in the printing ink, plastics, coatings, and non-destructive testing (NDT) industries, where consistent color strength and performance are critical.

Application

• Industrial Inks and Dyes: A key colorant for solvent-based printing inks, flexographic inks, and specialty dyes, providing vibrant yellow hues.
• Plastics and Polymer Coloring: Used for mass coloration of engineering plastics, synthetic fibers, and masterbatches where high thermal stability is required.
• Coatings and Paints: Incorporated into industrial coatings, automotive paints, and decorative finishes for its color intensity and solvent compatibility.
• Non-Destructive Testing (NDT): Serves as a fluorescent penetrant in liquid penetrant inspection (LPI) to detect surface cracks and defects in metal components.
• Chemical Synthesis: Acts as a fluorescent precursor or intermediate in the synthesis of more complex dyes and biological stains.
• Research and Analytical Reagents: Utilized in laboratory settings as a fluorescent tracer, pH indicator, or marker in various analytical techniques.

Basic Information

Product Name	Fluorescein (Solvent Yellow 94)
CAS No.	126605-73-0
Molecular Formula	C20H12O5
Molecular Weight	332.31 g/mol
Synonyms	Solvent Yellow 94; C.I. 45350:1; Fluorescein Base; D&C Yellow No. 7; Acid Yellow 73 (spirit soluble); 9-(o-Carboxyphenyl)-6-hydroxy-3H-xanthen-3-one; 2-(6-Hydroxy-3-oxo-3H-xanthen-9-yl)benzoic Acid
EINECS	Contact for details

Quality Control

Our Fluorescein (Solvent Yellow 94) is manufactured under a strict quality management system to ensure batch-to-batch consistency and reliability. Each lot is subjected to comprehensive analytical testing, including identity confirmation, purity assay, and impurity profiling. A Certificate of Analysis (COA) detailing all test results 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). Keep away from heat sources and incompatible materials. The product is light-sensitive and should be stored away from direct light exposure.

Specification

Item	Specification
Appearance	Orange-red to brownish-red powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 1.0%
Solubility (in Ethanol)	Complete, clear solution
Heavy Metals (as Pb)	≤ 20 ppm
Fluorescence Intensity	Conforms to customer requirement

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