Bismarck Brown R
Bismarck Brown R (CAS: 5421-66-9), with the molecular formula C21H24N8 · 2HCl and a molecular weight of 461.39 g/mol, is a chemical compound primarily utilised as a biological stain. It is valued for its ability to selectively stain certain cellular components, finding application in microscopy and histological preparations for research purposes. This dye aids in visualising tissue structures and cellular elements in various biological studies.
- IUPAC
- Basic Brown 4,Vesuvine
- Synonyms
- Vesuvine

Biological Staining
Bismarck Brown R is employed as a stain in cell biology and histology. It is particularly useful for differential staining of cellular structures, such as elastic fibres and cartilage, in microscopic examination.
Histological Preparations
In the field of hematology and histology, this compound serves as a valuable reagent for preparing tissue samples. Its staining properties assist in the identification and visualisation of specific tissue components for diagnostic and research purposes.
Research Reagent
As a chemical compound listed under Stains & Dyes, Bismarck Brown R functions as a research reagent. It supports various laboratory investigations requiring specialised staining techniques to observe biological specimens.
| Molecular weight | 461.39 |
|---|---|
| Empirical formula | C21H24N8 · 2HCl |
| Melting point | 222 °C (dec.)(lit.) |
| Protective equipment | Eyeshields, Gloves, type N95 (US), type P1 (EN143) respirator filter |
|---|---|
| Water hazard class (WGK, DE) | 3 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
| Colour Index Number | 21010 |
|---|
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is Bismarck Brown R used for?
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Bismarck Brown R is primarily used as a biological stain in cell biology and histology for the differential staining of cellular components and tissue structures.
What is the CAS number and formula for Bismarck Brown R?
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The CAS number for Bismarck Brown R is 5421-66-9, and its empirical formula (Hill notation) is C21H24N8 · 2HCl.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Bismarck Brown R, identified by CAS 5421-66-9. The specific grade and purity (assay) available will be detailed on the product's Certificate of Analysis. TSS does not represent this product as USP, BP, EP, or pharmaceutical grade unless explicitly stated in the product documentation.
What are the safety and handling precautions for Bismarck Brown R?
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Bismarck Brown R (CAS 5421-66-9) requires careful handling. Personal protective equipment such as eyeshields and gloves is recommended. A respirator filter (type N95 or P1) should be used. The substance has a WGK Germany classification of 3, indicating it is hazardous to water. Consult the Safety Data Sheet for detailed hazard information and handling procedures.
How is Bismarck Brown R packed and shipped?
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Bismarck Brown R is carefully packed according to industry standards for chemical transport to ensure safe handling and transit. Tech Serve Solutions can export this chemical globally.
How can I request a quote or sample for Bismarck Brown R?
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To request a quote or a sample of Bismarck Brown R (CAS 5421-66-9), please contact the Tech Serve Solutions sales team through our website or by phone, providing your details and the product's CAS number.
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