Eosine blue

Name: Eosine blue
Brand: Vaqora Chemicals
SKU: VQ-000558

About Eosine blue

Listed under CAS 548-24-3, Eosine blue is a biological stain available from Vaqora Chemicals (Microscopy grade). With the molecular formula C20H6Br2N2Na2O9, it has a molar mass of 624.1 g/mol. Its systematic (IUPAC) name is disodium, 4',5'-dibromo-2',7'-dinitro-3-oxospiro[2-benzofuran-1,9'-xanthene]-3',6'-diolate. It is also known as Acid Red 91 or Eosin Scarlet.

The product is provided as a powder. Keep the container tightly sealed and store it in a cool, dry area. Under GHS it is labelled “Danger”, so handle it with suitable PPE and consult the SDS.

It is commonly used for histology and cytology staining, microscopy, clinical laboratories and biological staining. Typical end-use sectors are academic and industrial research, diagnostics and biotechnology and textiles and dyeing.

Available in 25 g, 100 g, 500 g and 1 kg packs, Eosine blue is dispatched with a Certificate of Analysis (COA) to destinations worldwide.

Typical applications

Histology & cytology staining
Microscopy
Clinical laboratories
Biological staining

Industries

Specifications & identifiers

Chemical identifiers
Product name	Eosine blue
Catalogue No.	VQ-000558
CAS Number	548-24-3
IUPAC name	disodium;4',5'-dibromo-2',7'-dinitro-3-oxospiro[2-benzofuran-1,9'-xanthene]-3',6'-diolate
Molecular formula	C₂₀H₆Br₂N₂Na₂O₉
Molecular weight	624.1 g/mol
Exact mass	623.8215
Grade	Microscopy
HSN code	32049000
InChIKey	QGAYMQGSQUXCQO-UHFFFAOYSA-L
SMILES	C1=CC=C2C(=C1)C(=O)OC23C4=CC(=C(C(=C4OC5=C(C(=C(C=C35)[N+](=O)[O-])[O-])Br)Br)[O-])[N+](=O)[O-].[Na+].[Na+]
PubChem CID	12961637

Physical properties
Physical form	Powder
Appearance	Powder
H-bond donors / acceptors	0 / 9
TPSA	173 Å²
Synonyms	4',5'-Dibromo-2',7'-dinitrofluorescein disodium salt, Acid Red 91, Eosin Scarlet, Eosin bluish, Saffrosine, Eosin B sodium salt, C.I. Acid Red 91, Bluish, Eosine, Eosine BN, Eosin BA, Dibromodinitrofluorescein sodium, Eosine BA

Safety & hazard information (GHS)

Corrosive

Signal word: Danger

Hazard statements

H318Causes serious eye damage

Precautionary statements: P264 + P265, P280, P305 + P354 + P338, P317

Classification is indicative (aggregated GHS notifications) and may vary by grade and concentration. Always refer to the SDS supplied with your lot.

Documents

Safety Data Sheet (SDS)16-section GHS · on request Certificate of AnalysisTypical / batch COA · on request Specification sheetTDS / MOA · on request

Frequently asked questions

What is the CAS number of Eosine blue?

The CAS Registry Number of Eosine blue is 548-24-3. It is also known as 4',5'-Dibromo-2',7'-dinitrofluorescein disodium salt, Acid Red 91, Eosin Scarlet.

What is the molecular formula and molecular weight of Eosine blue?

Eosine blue has the molecular formula C20H6Br2N2Na2O9 and a molecular weight of 624.1 g/mol.

Which grade and pack sizes of Eosine blue can I order?

We supply Eosine blue in Microscopy grade, in 25 g, 100 g, 500 g, 1 kg, 4 x 25 kg packs. Larger bulk quantities and custom packing are quoted on request.

Do you provide a COA and SDS with Eosine blue?

Yes. Every lot of Eosine blue is shipped with a batch-specific Certificate of Analysis, and a 16-section GHS Safety Data Sheet is provided with the quotation and the shipment.

Can Eosine blue be shipped internationally?

Yes. Eosine blue is classified as hazardous, so it is packed in UN-approved packaging and shipped as dangerous goods under IATA/IMDG rules. We export worldwide on EXW, FOB, CIF and DAP terms.