Fluorescein is a synthetic organic compound often used as a fluorescent dye. In solid form it is a dark orange/red powder; however, very dilute alkaline solution or alcohol solution of it exhibits intense greenish yellow fluorescence by reflected light.
Fluorescein is used for varieties of flourescence applications in many different industries.

Molar mass: 332.31 g/mol
Formula: C20H12O5
Melting point: 597.2蚌 (314蚓)
Solubility in water: Slightly
Density: 1.602 g/mL
GHS hazard statements: H319
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CAS Number: 2321-07-5