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Fluorescent dyes and stains

Eosin B

Also known as Acid Red 91, C.I. Acid Red 91, Saffrosine

CAS 548-24-3Formula C20H6Br2N2Na2O9Molar mass 624.06 g/molEC 208-943-1
GHS signal word: Danger. Pictograms: Corrosive 11 suppliers listed
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Eosin B chemical structure, C20H6Br2N2Na2O9, CAS 548-24-3
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
548-24-3
Formula
C20H6Br2N2Na2O9
Molar mass
624.06 g/mol
EC number
208-943-1
HS code
320412
Category
Fluorescent dyes and stains

What is Eosin B?

Plain description, key identifiers and synonyms

Eosin b is an organic sodium salt which is the disodium salt of eosin b diphenol. It has a role as a fluorescent dye and a histological dye. It contains an eosin b(2-).

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
disodium, 4',5'-dibromo-2',7'-dinitro-3-oxospiro[2-benzofuran-1,9'-xanthene]-3',6'-diolate
CAS number
548-24-3Other or deprecated CAS: 134829-78-0
EC number
208-943-1
Molecular formula
C20H6Br2N2Na2O9
UNII
OMS4XQD1T0
InChIKey
QGAYMQGSQUXCQO-UHFFFAOYSA-L
InChI
InChI=1S/C20H8Br2N2O9.2Na/c21-13-15(25)11(23(28)29)5-9-17(13)32-18-10(6-12(24(30)31)16(26)14(18)22)20(9)8-4-2-1-3-7(8)19(27)33-20;;/h1-6,25-26H;;/q;2*+1/p-2
SMILES (canonical and isomeric)
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+]

Synonyms

  • Acid Red 91
  • C.I. Acid Red 91
  • Saffrosine
  • Eosine i bluish
  • Bluish, Eosine
  • Eosine BN
  • Eosin BA
  • Dibromodinitrofluorescein sodium
  • Eosine BA
  • Eosine BNX
  • C.I. 45400
  • Spiro(isobenzofuran-1(3H),9'-(9H)xanthen)-3-one, 4',5'-dibromo-3',6'-dihydroxy-2',7'-dinitro-, disodium salt
  • Bluish, Eosine I
  • D.C. Red No. 27
  • Eosine B
  • Eosine Bluish
  • disodium, 4',5'-dibromo-2',7'-dinitro-3-oxospiro[2-benzofuran-1,9'-xanthene]-3',6'-diolate
  • 2-(4,5-Dibromo-3,6-dihydroxy-2,7-dinitroxanthen-9-yl)-benzoic acid, disodium salt
  • Spiro[isobenzofuran-1(3H),9'-[9H]xanthen]-3-one,4',5'-dibromo-3',6'-dihydroxy-2',7'-dinitro-, disodium salt
  • 4',5'-Dibromo-2',7'-dinitrofluorescein disodium salt
  • Hydroxydibromodinitro-o-carboxyphenylfluorone sodium
  • 4',5'-Dibromo-3',6'-dihydroxy-2',7'-dinitrospiro(isobenzofuran-1(3H),9'-(9H)xanthen)-3-one sodium salt (1:2)
  • Disodium 4',5'-dibromo-2',7'-dinitro-3-oxo-3H-spiro[[2]benzofuran-1,9'-xanthene]-3',6'-bis(olate)
  • Disodium 4',5'-dibromo-2',7'-dinitro-3-oxo-3H-spiro[2-benzofuran-1,9'-xanthene]-3',6'-bis(olate)
  • disodium 4',5'-dibromo-2',7'-dinitro-3-oxo-3H-spiro[2-benzofuran-1,9'-xanthene]-3',6'-diolate
Show all 26 synonyms
  • disodium, 4',5'-dibromo-2',7'-dinitro-3-oxo-spiro[isobenzofuran-1,9'-xanthene]-3',6'-diolate

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

No measured properties are recorded for this substance yet. Ask suppliers for a technical data sheet.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
624.06 g/molcalc.
Exact mass
621.8235 Dacalc.
LogP (octanol/water)
-2.25calc.
Topological polar surface area
167.9 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
9calc.
Rotatable bonds
2calc.
Heavy atoms
35calc.
Rings
5calc.
Aromatic rings
3calc.
Fraction sp3 carbons
0.05calc.
Formal charge
0calc.
Stereocentres
0calc.
Components
3calc.
Lipinski rule of five
Passes (1 violation)calc.

Calculated for screening. Confirm critical figures with the supplier.

Murcko scaffold

The ring system that remains when every side chain is removed

Murcko scaffold of this chemical, O=C1OC2(c3ccccc3Oc3ccccc32)c2ccccc21

O=C1OC2(c3ccccc3Oc3ccccc32)c2ccccc21

5 rings, 23 atoms, the Fluoran ring system.

438 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS05: Corrosive
Corrosive

Hazard statements

  • H318Causes serious eye damage.
Precautionary statements (4)
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P305 + P354 + P338If in eyes: Immediately rinse with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P317Get medical help.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Eosin B suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 11 suppliers
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Where suppliers are based

11 suppliers in 4 countries

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Eosin B price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Pharmacological actions

  • Fluorescent Dyes

Roles

  • dye
  • fluorescent dye
  • histological dye

Regulatory status

Inventories, regulations and trade controls that list this substance

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Eosin B is traded under.

HS 3204.12Indicative HS code

Acid dyes, whether or not premetallised, and preparations based thereon, mordant dyes…

World exports in 2024
$792M
+6.2% vs 2023, imports $791M
2019 to 2024
Top exporters
  1. India * partner reported34.9%
  2. China9.3%
  3. Germany7.4%
Top importers
  1. China15.3%
  2. Italy8.2%
  3. United States7.3%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for Eosin B is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Eosin B, based on the data on this page

What is Eosin B?

Eosin b is an organic sodium salt which is the disodium salt of eosin b diphenol. It has a role as a fluorescent dye and a histological dye. It contains an eosin b(2-).

What is the CAS number of Eosin B?

The CAS registry number of Eosin B is 548-24-3. Other or deprecated CAS numbers: 134829-78-0.

What is the molecular formula and weight of Eosin B?

The molecular formula of Eosin B is C20H6Br2N2Na2O9 and its molar mass is 624.06 g/mol.

What is Eosin B used for?

Known uses and roles of Eosin B include textile dyes in textiles and leather, indicators and stains in research and laboratory, dye, fluorescent dye, histological dye and 1 more.

Is Eosin B hazardous?

Eosin B carries the GHS signal word "Danger". Main hazards: causes serious eye damage. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Eosin B?

Eosin B is usually classified under HS code 320412 (Acid dyes, whether or not premetallised, and preparations based thereon, mordant dyes…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Eosin B?

CompoundList lists 11 suppliers of Eosin B in India, United States, China and Czech Republic. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Eosin B in India?

7 suppliers in India list Eosin B on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Eosin B?

Suppliers quote Eosin B on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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