Molekula
Biebrich Scarlet
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Biebrich Scarlet is a bright red azo dye, primarily used in microscopy and histology for staining biological tissues and cells. As an anionic acid dye, it binds to basic proteins in cytoplasm, muscle and collagen, and serves as the plasma stain in Masson's trichrome, providing contrast for light microscopy applications. This chemical has a CAS number of 4196-99-0, with the molecular formula C22H14N4Na2O7S2 and a molecular weight of 556.48. It is stored at ambient conditions and carries a signal word of Warning for safety. Molekula supplies Biebrich Scarlet 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
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.
-
100 g — £51.50 per pack ex VAT · £61.80 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 | Dark brown powder |
| Loss on Drying | ≤ 15% |
| Wavelength of Max. Absorption | 506 - 510nm |
| Specific Absorbance (E 1%/1cm) | ≥ 530 |
| Solubility (0.1% water) | Clear red solution |
| Total Colour/ Assay | ≥ 70% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Acid |
Identification
| Property | Value |
|---|---|
| SKU | 21468532 |
| CAS Number | 4196-99-0 |
| IUPAC Name | disodium;2-[(2-hydroxynaphthalen-1-yl)diazenyl]-5-[(4-sulfonatophenyl)diazenyl]benzenesulfonate |
| EC Number | 224-084-5 |
| Molecular Formula | C22H14N4Na2O7S2 |
| Molecular Weight | 556.48 |
| Exact Mass | 556.0099 |
| SMILES | C1=CC=C2C(=C1)C=CC(=C2N=NC3=C(C=C(C=C3)N=NC4=CC=C(C=C4)S(=O)(=O)[O-])S(=O)(=O)[O-])O.[Na+].[Na+] |
| InChIKey | VVAVKBBTPWYADW-UHFFFAOYSA-L |
| InChI | InChI=1S/C22H16N4O7S2.2Na/c27-20-12-5-14-3-1-2-4-18(14)22(20)26-25-19-11-8-16(13-21(19)35(31,32)33)24-23-15-6-9-17(10-7-15)34(28,29)30;;/h1-13,27H,(H,28,29,30)(H,31,32,33);;/q;2*+1/p-2 |
| PubChem CID | 20170 |
| REACH Code | Y113 |
| TSCA Listed | Yes |
| HTS Code | 2927005000 |
| Tariff Code | 2927000090 |
Safety & GHS
-
Health Hazard
GHS07
Hazard statements
- H315 Causes skin irritation
- H319 Causes serious eye irritation
- H335 May cause respiratory irritation
Precautionary statements
- P260 Do not breathe dust/fume/gas/mist/vapours/spray
- P264 Wash thoroughly after handling
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P302+352 IF ON SKIN: Wash with soap and water
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
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.
Synonyms
- Acid Scarlet BA
- C.I. Acid Red 66
- Calcochrome Red 650
- Croceine scarlet
- Fast Scarlet BA
- Fenazo Scarlet B
- Imperial Scarlet 3B
- Imperial Scarlet 3BN
- Ponceau BS
- Scarlet 3B
Frequently asked questions
What is Biebrich Scarlet used for?
Biebrich Scarlet is primarily used as a dye in microscopy and histology for staining biological tissues, particularly in differentiating cell structures.
What is the chemical formula and molecular weight of Biebrich Scarlet?
The chemical formula is C₂₂H₁₄N₄Na₂O₇S₂, and the molecular weight is 556.48 g/mol.
How should Biebrich Scarlet be stored?
Store at ambient temperature in a dry, well-ventilated area, away from direct sunlight and incompatible substances.
What grade of Biebrich Scarlet does Molekula supply?
Molekula supplies analytical and reagent-grade Biebrich Scarlet, suitable for laboratory and research applications.
Can Molekula supply Biebrich Scarlet in bulk quantities?
Yes, Molekula can provide Biebrich Scarlet in bulk, depending on availability—please contact us for pricing and lead times.
What documentation comes with an order of Biebrich Scarlet?
Each order includes a Certificate of Analysis (CoA), Safety Data Sheet (SDS), and batch-specific documentation for traceability.
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.