Fluorescein sodium

IUPAC name: 3-oxospiro[2-benzofuran-1,9'-xanthene]-3',6'-diolate, disodium salt
Alternative names: C.I. Acid Yellow 73; C.I. 45350; 11824 Yellow; Abbey Uranine WSS; ABCO Uranine; ABCOL Uranine; Aizen Uranine; Akacid Sodium Fluorescein; Basacid Yellow 226; C Yellow 8; C Yellow No. 8; C Yellow No. 8-307225; Colircusi Fluoresceina; D and C Yellow No. 7; D and C Yellow No. 8; D&C Yellow No. 7; D&C Yellow No. 8; Daiwa Uranine; Dinacid Florescence Uranine; Diofluor; FL 4631; Fluo-rectal; Fluorescein; Fluorescein GDC; Fluorescein LT; Fluorescein Sodium B.P; Fluorescein, disodium salt; Fluoresceine; Fluoresceine Extra 019187; Fluoresceine LT; Fluoresceine Sodium GP; Fluorescéine sodique Faure; Fluoresceine W742; Fluorin; Funduscein; Leadacid Uranine BG Ex. Conc.; Neelicol Fluorescein; Neelicol U ranine; Orcoacid Fluoresceince; Permalon Uranine WSS; Phoebe Fluoresceine 200%; Raincid Uranine Extra; Sandolan Yellow N3GL; Sicomet Uranin S 45350; Simacid Fluoresceine LT; Simacid Fluoresceine Sodium; Sodium Fluorescein; Triacid Fluoresceine; Uranine; Uranine SSO; Uranine U 307027; Urotropin; Urotropine; Victacid Uranine; 3′,6′-dihydroxyspiro[isobenzofuran-1(3H),9′-[9H]xanthen]-3-one; 5(6)-Carboxyfluorescein sodium; disodium 2-(3-oxo-6-oxidoxanthen-9-yl)benzoate; Spiro[isobenzofuran-1(3H),9'-[9H]xanthen]-3-one,3',6'-dihydroxy-, disodium salt

General description of the product

Molecular formula: C20H10Na2O5
Molar weight: 376,275 g/mol
CAS number: 518-47-8
EC number: 208-253-0
PubChem: 16850
ChemSpider: 15968
Fluorescein sodium molecule structure
Fluorescein sodium is a synthetic organic dye. Soluble in water and alcohol. Dark orange/red powder. Widely used as a fluorescent tracer for many applications. Fluorescein is a fluorophore commonly used in microscopy and specroscopy. Also used in a type of dye laser as the gain medium, in forensics and serology to detect latent blood stains, and in dye tracing. Fluorescein has an absorption maximum at 494 nm and emission maximum of ca. 512 nm (in water) the exact value depends on the pH. The isosbestic point is 460 nm on which the absorption is the same at this wavelength at any pH. Fluorescein dye solutions, typically 15% active, are commonly used as an aid to leak detection during hydrostatic testing of subsea oil and gas pipelines and other subsea infrastructure. Leaks can be detected by divers carrying ultraviolet lights. It is also used as a rodsman bait as the shade is inviting the fishes.


Property specification unit
Appearance Fine powder
Tinting strength 100,0 ± 5 %
Colour (drawdown) similar to standard


Classification according to European Regulation (EC) No 1272/2008
Not dangerous
Labelling according to Regulation (EC) No 1272/2008 (CLP)
Not needed
Information regarding to transport
The product is not classified as dangerous for transport.

Other information

Customs tariff number: 3204120090
Article number: 94407922 (50 g/bottle)
Article number: 94407939 (150 g/bottle)
Article number: 94407946 (1 kg/bottle)
Article number: 94407826 (5-25 kg/carton box)
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