C20H10Na2O5
376.3 g/mol
Dye & PigmentWarning
Fluorescein disodium salt
CAS518-47-8EC208-253-0
Category
Dye & Pigment
Compound Class
Heterocycle
Primary Use
Textile dye and fluorescent tracer
Fluorescein disodium salt is a water-soluble, orange-red to dark red powder that is practically odorless and almost tasteless. It is widely used as a textile dye and as a fluorescent tracer due to its intense fluorescence.
Textile dyeing for silk and woolFluorescent tracer for tracing underground water streams and factory effluentsDiagnostic aid for evaluating corneal trauma
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
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Related Compounds
ReferenceSame Category
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Vat dye for textiles
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Dye intermediate
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Solvent dye for plastics
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Fluorescent solvent dye
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aluminum lake pigment
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Histological stain for microscopy
Safety Reference
Warning
H315Causes skin irritation
H319Causes serious eye irritation
Customs Tariff Classification
The international HS code for Fluorescein disodium salt (CAS 518-47-8) is 3204.90.
HS code (international, 6-digit)
3204.90
EU CN code (8-digit)
3204 90 00
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
Identifiers
IUPAC Name
disodium;2-(3-oxido-6-oxoxanthen-9-yl)benzoate
InChIKey
NJDNXYGOVLYJHP-UHFFFAOYSA-L
SMILES
C1=CC=C(C(=C1)C2=C3C=CC(=O)C=C3OC4=C2C=CC(=C4)[O-])C(=O)[O-].[Na+].[Na+]
Synonyms (65)
- Fluorescein sodium (JP17/USP)
- 11824 Yellow
- 12417 Yellow
- Acid yellow 73 sodium salt
- Aizen uranine
- Ak-Fluor
- Basacid Yellow 226
- Bioglo
- C.I. 45350 Disodium salt
- C.I. Acid Yellow 73
- CI 45350 (Na salt)
- Calcocid uranine B4315
- Certiqual fluoresceine
- D&C Yellow No. 8
- Dry Eye Test
- FLUORESCEIN SODIUM [MART.]
- Floures (TN)
- Fluor-I-Strip
- Fluor-I-strip A.T.
- Fluor-amps
- Fluorescein Free Acid
- Fluorescein LT
- Fluorescein disodium salt
- Fluorescein sodium B.P
- Fluorescein, Sodium
- Fluorescein, soluble
- Fluoresceinum natricum
- Flurenate
- Funduscein
- Furanium
- Glostrips
- Hidacid uranine
- Japan Yellow 202(1)
- Ki202(1)
- Ki202(2)
- Obiturine
- Resorcinol phthalein sodium
- Retinofluor
- Sodium fluorescein
- Sodium fluoresceinate
- Soluble Fluoresceine BPS
- Soluble fluorescein
- Soluble fluoresceine
- Uranin
- Uranin A
- Uranin S
- Uranine A
- Uranine A Extra
- Uranine O
- Uranine SS
- Uranine WSS
- Uranine Yellow
- Yellow 8
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