FLUORESCEIN SODIUM POWDER C.I. ACID YELLOW 73 Colour Index No. 45350 (CI 45350)
Fluorescein is a synthetic organic compound available as a dark orange/red powder soluble in water and alcohol. It is widely used as a fluorescent water tracer and as a general dye.
Manufacturing Methods : Commonly known as sodium fluorescein. Resorcinol and Phthalic anhydride alone or in the presence of zinc chloride or sulfuric acid condensation, is fluorescein, and then converted to sodium or potassium salt, sodium fluorescein is (or potassium).
Chemical & Physical properties
Other names: Water Soluble fluorescein; C.I. Acid yellow 73, Fluorescein disodium salt, Uranine, Funduscein, CI 45350,
M.Wt: 376.28
CAS No: 518-47-8
Formula: C20H10Na2O5
Appearance: Odourless orange powder
Melting point: >300C
pH (1% solution): 8.0 - 9.5
pH range: 4.0-6.0
Solubility: soluble in water, slightly soluble in ethanol, MPG, DPG, glycerine
UV visible: 491nm, 493.5nm, 490nm
Excitation wavelength: 460nm
Emission wavelength: 515nm
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