Molekula
Bismarck Brown R (C.I. 21010)
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
Bismarck Brown R (C.I. 21010) is a diazo dye, primarily used in microscopy, histology, and biological staining for proteins, nucleic acids, and connective tissues. It produces a deep brown coloration, making it ideal for highlighting cellular structures in research and medical diagnostics. This chemical has a CAS number of 5421-66-9, a molecular weight of 461.39, and is stored at ambient conditions. It carries a signal word of "Warning" for safety classification. Molekula supplies Bismarck Brown R 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.
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25 g — £26.40 per pack ex VAT · £31.68 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 | Black to Dark brown powder |
| Melting Point | 222°C |
| Solubility | Very soluble in water, soluble in ethanol and slightly soluble in acetone |
| Dye Content | 100±5 |
| Lambda max | 468nm |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Transport Class | 9 |
| Packing Group | III |
| Acidity | Neutral |
Identification
| Property | Value |
|---|---|
| SKU | 14413881 |
| CAS Number | 5421-66-9 |
| Molecular Formula | 5421-66-9 |
| Molecular Weight | 461.39 |
| SMILES | CC1=C(C=C(C=C1)N=NC2=C(C=C(C(=C2)C)N)N)N=NC3=C(C=C(C(=C3)C)N)N.Cl.Cl |
| UN Number | UN3077 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 2927005000 |
| Tariff Code | 2927000090 |
Safety & GHS
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Health Hazard
GHS07
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Serious Health Hazard
GHS08
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Hazardous to the Environment
GHS09
Hazard statements
- H303 May be harmful if swallowed
- H315 Causes skin irritation
- H317 May cause an allergic skin reaction
- H319 Causes serious eye irritation
- H351 Suspected of causing cancer
Precautionary statements
- P261 Avoid breathing dust/fume/gas/mist/vapours/spray
- P273 Avoid release to the environment
- 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
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
No alternate names recorded for this product.
Frequently asked questions
What is Bismarck Brown R (C.I. 21010) commonly used for?
Bismarck Brown R is primarily used as a dye in histological staining, particularly for staining collagen and connective tissues in biological samples.
What is the chemical formula and molecular weight of Bismarck Brown R?
The molecular formula is not explicitly provided, but the CAS number is **5421-66-9** with a molecular weight of **461.39 g/mol**.
How should Bismarck Brown R be stored?
Store at ambient temperature in a cool, dry place, away from direct sunlight and incompatible substances.
What grade or purity is available for Bismarck Brown R?
Molekula supplies Bismarck Brown R in **analytical grade** for laboratory and research applications.
Can Molekula supply Bismarck Brown R in bulk quantities?
Yes, bulk quantities are available upon request—please contact our sales team for pricing and lead times.
What documentation comes with an order of Bismarck Brown R?
Each order includes a **Certificate of Analysis (CoA)**, Material Safety Data Sheet (MSDS), and a product specification sheet.
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.