Molekula
Tetrabromofluorescein potassium salt
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 1999 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Tetrabromofluorescein potassium salt, also known as Eosin Y (Acid Red 87), is a synthetic fluorescent dye, primarily used as a histological and biological stain, most notably as the eosin counterstain in haematoxylin and eosin (H&E) staining. It is also used as an adsorption indicator in argentometric (Fajans) halide titrations. This chemical has a CAS number of 56897-54-2, with the molecular formula C20H6Br4K2O5 and a molecular weight of 724.08 g/mol. Store it at 2–8°C, and handle it with caution—it carries a Warning signal word for potential hazards. Molekula supplies Tetrabromofluorescein potassium salt from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
Pack sizes & pricing
Pricing on request — packs available from research to bulk quantities.
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Specifications
| Property | Value |
|---|---|
| Appearance | Reddish brown powder |
| Loss on Drying | ≤5.0% |
| Solubility | (0.1% distilled water) Dark red and clear solution. |
| Absorptivity1%/1cm@517nm | 1220 |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | 2 to 8 °C |
| Acidity | Neutral |
Identification
| Property | Value |
|---|---|
| SKU | 90037569 |
| CAS Number | 56897-54-2 |
| IUPAC Name | dipotassium;2-(2,4,5,7-tetrabromo-3-oxido-6-oxoxanthen-9-yl)benzoate |
| Molecular Formula | C20H6Br4K2O5 |
| Molecular Weight | 724.08 |
| Exact Mass | 723.6182 |
| SMILES | C1=CC=C(C(=C1)C2=C3C=C(C(=O)C(=C3OC4=C(C(=C(C=C24)Br)[O-])Br)Br)Br)C(=O)[O-].[K+].[K+] |
| InChIKey | GZAAPEKTGHKWRZ-UHFFFAOYSA-L |
| InChI | InChI=1S/C20H8Br4O5.2K/c21-11-5-9-13(7-3-1-2-4-8(7)20(27)28)10-6-12(22)17(26)15(24)19(10)29-18(9)14(23)16(11)25;;/h1-6,25H,(H,27,28);;/q;2*+1/p-2 |
| PubChem CID | 12598436 |
| REACH Code | Y110 |
| Tariff Code | 3204900090 |
Safety & GHS
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Health Hazard
GHS07
Hazard statements
- H302 Harmful if swallowed
- H315 Causes skin irritation
- H319 Causes serious eye irritation
- H335 May cause respiratory irritation
Precautionary statements
- P261 Avoid breathing dust/fume/gas/mist/vapours/spray
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P302+352 IF ON SKIN: Wash with soap and water
- P304+340 IF INHALED: Remove victim to fresh air and keep at rest in a position comfortable for breathing
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
- P308+313 IF exposed or concerned: Get medical advice/attention
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Portuguese, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- Acid Red 87 potassium
- ACID RED 87, POTASSIUM SALT
- C20H6Br4K2O5
- DIPOTASSIUM 2',4',5',7'-TETRABROMOFLUORESCEIN
- dipotassium eosin YS(2-)
- dipotassium;2-(2,4,5,7-tetrabromo-3-oxido-6-oxoxanthen-9-yl)benzoate
- EOSIN YSK
- GZAAPEKTGHKWRZ-UHFFFAOYSA-L
- potassium 2-(2,4,5,7-tetrabromo-6-oxido-3-oxo-3H-xanthen-9-yl)benzoate
- RED NO. 230(2)
Frequently asked questions
What is tetrabromofluorescein potassium salt used for?
It is commonly used as a fluorescent dye in biological staining, pH indicators, and forensic applications due to its bright fluorescence under UV light.
What is the chemical formula and molecular weight?
The formula is C₂₀H₆Br₄K₂O₅ with a molecular weight of 724.08 g/mol.
How should tetrabromofluorescein potassium salt be stored?
Store at 2–8°C in a cool, dry place, protected from light and moisture.
What purity grades are available for this product?
Typically available in analytical or reagent grade—contact Molekula for specific purity details and certifications.
Can Molekula supply this product in bulk quantities?
Yes, bulk quantities are available upon request—please inquire for pricing, lead times, and packaging options.
What documentation comes with the order?
Each order includes a Certificate of Analysis (CoA), Material Safety Data Sheet (MSDS), and batch-specific documentation.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.