Fluoresceine

C.I.Solvent Yellow 94

Molecular Formula:C₂₀H₁₂O₅

Molecular Weight: 332.31

CAS Registry Number:518-45-6

C.I.45350:1

Molecular Structure: Xanthene

Properties and Applications: yellow. Soluble in water and ethanol as yellow, with strong green fluorescence. In concentrated sulfuric acid to yellow, with weak fluorescence, dilution after yellow, with yellow precipitation. Dye aqueous solution to join sodium hydroxide color dark, with dark green fluorescence. The dye for C.I. Acid Yellow 73 free Acid. Used in cosmetics coloring.

Standard	Light Fastness	Heat-resistant(℃)		water	Sodium Carbonate(5%)	Hydrochloric acid(5%)
		Melting point	Stable
ISO	Poor			Insoluble	General	No change