Molekula
Erythrosin B
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
Erythrosin B is a synthetic fluorescent dye and food coloring, primarily used in pharmaceuticals, cosmetics, and biological staining applications for its red-orange hue. It is also employed as a tracer in scientific research and microscopy. This chemical has a CAS number of 15905-32-5, a molecular formula of C20H8I4O5, and a molecular weight of 835.9 g/mol. It is stable at ambient storage conditions and carries no signal word for hazard classification.
Molekula supplies Erythrosin B at 87-100 % purity in 25 g packs, from £122.16 inc. VAT. It is in stock for same-day dispatch. Every batch ships with a certificate of analysis, and safety data sheets are available in 5 languages. Larger quantities, up to multi-tonne, are quoted on request.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
In stock — same-day dispatch
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
-
25 g — £101.80 per pack ex VAT · £122.16 inc. VAT
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | Orange/red/pink powder solid |
| Loss on Drying | ≤ 10 % |
| Assay | 87-100 % |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Neutral |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Melting Point | 303 °C |
Source: PubChem CID 3259 (Human Metabolome Database (HMDB))
Identification
| Property | Value |
|---|---|
| SKU | 39273343 |
| CAS Number | 15905-32-5 |
| IUPAC Name | 3',6'-dihydroxy-2',4',5',7'-tetraiodospiro[2-benzofuran-3,9'-xanthene]-1-one |
| EC Number | 240-046-0 |
| Molecular Formula | C20H8I4O5 |
| Molecular Weight | 835.9 |
| Exact Mass | 835.6551 |
| SMILES | C1=CC=C2C(=C1)C(=O)OC23C4=CC(=C(C(=C4OC5=C(C(=C(C=C35)I)O)I)I)O)I |
| InChIKey | OALHHIHQOFIMEF-UHFFFAOYSA-N |
| InChI | InChI=1S/C20H8I4O5/c21-11-5-9-17(13(23)15(11)25)28-18-10(6-12(22)16(26)14(18)24)20(9)8-4-2-1-3-7(8)19(27)29-20/h1-6,25-26H |
| PubChem CID | 3259 |
| REACH Code | Y113 |
| TSCA Listed | Yes |
| HTS Code | 3212900050 |
| Tariff Code | 321290000 |
Safety & GHS
Precautionary statements
- P264 Wash thoroughly after handling
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P308+313 IF exposed or concerned: Get medical advice/attention
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, 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.
Quality certificates
Molekula Group is certified to ISO 9001:2015 (quality) and ISO 14001:2015 (environmental management), audited by a UKAS-accredited body. Both certificates are valid to 17 May 2028.
Synonyms
- 2',4',5',7'-Tetraiodofluorescein
- 3',6'-dihydroxy-2',4',5',7'-tetraiodospiro[2-benzofuran-3,9'-xanthene]-1-one
- ERYTHROSINE
- Erythrosine acid
- Erythrosine, phenolic
- Erythrosine, sodium anhydrous
- FD & C red no. 3
- Iodeosin
- Solvent Red 140
- Tetraiodofluorescein
Frequently asked questions
What is Erythrosin B commonly used for?
Erythrosin B is primarily used as a red fluorescent dye in biological stains, food coloring (E127), and as a tracer in medical and scientific research applications.
What is the chemical formula and molecular weight of Erythrosin B?
The chemical formula is C₂₀H₈I₄O₅, and the molecular weight is 835.9 g/mol.
How should Erythrosin B be stored?
Store Erythrosin B at ambient temperature in a cool, dry place, away from direct sunlight and moisture.
What purity grades of Erythrosin B does Molekula offer?
Molekula supplies Erythrosin B as an orange/red/pink powder solid to a specification of 87-100 % assay and loss on drying of 10 % or less. No specific grade designation is assigned to this product.
Can Molekula supply Erythrosin B in bulk quantities?
Yes, Molekula can provide Erythrosin B in bulk quantities upon request, with flexible packaging options for large-scale orders.
What documentation is included with an Erythrosin B order?
Each order includes a Certificate of Analysis (CoA), Material Safety Data Sheet (MSDS), and batch-specific documentation for traceability.
Where can I buy Erythrosin B?
Directly from Molekula, which lists Erythrosin B in 25 g packs from £122.16 inc. VAT, with a certificate of analysis for every batch. Larger quantities are quoted on request. Molekula's offices: United Kingdom, France, Spain, Germany, Italy, United States and China.
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.