Molekula
Safranine O (C.I. 50240)
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
Safranine O (C.I. 50240) is a cationic dye used in histology, microbiology, and staining applications for biological specimens. It is the standard counterstain for Gram-negative bacteria in Gram staining, and industrially it serves as an azine dye for colouring leather. It is also employed in dye-sensitized solar cells and as a fluorescent probe. Available with CAS number 477-73-6, molecular formula C20H19ClN4, and molecular weight 350.84 g/mol. Stored at ambient temperature. Hazard classification includes signal word Danger. Molekula supplies Safranine O 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.
Often bought together
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.
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5 g — £39.80 per pack ex VAT · £47.76 inc. VAT
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25 g — £51.80 per pack ex VAT · £62.16 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 | Dark green powder |
| Melting Point | ≥ 240°C |
| Loss on Drying | ≤ 15.0% (at 110°C) |
| Absorptivity | ≥ 875 (A1%, 1cm at λmax) |
| Absorption Ratio | 1.10 - 1.32 (λmax ± 15nm) |
| Wavelength of Max. Absorption | 530 - 534nm |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Base |
Identification
| Property | Value |
|---|---|
| SKU | 42186946 |
| CAS Number | 477-73-6 |
| IUPAC Name | 3,7-dimethyl-10-phenylphenazin-10-ium-2,8-diamine chloride |
| EC Number | 207-518-8 |
| Molecular Formula | C20H19ClN4 |
| Molecular Weight | 350.84 |
| Exact Mass | 350.1298 |
| SMILES | CC1=CC2=C(C=C1N)[N+](=C3C=C(C(=CC3=N2)C)N)C4=CC=CC=C4.[Cl-] |
| InChIKey | OARRHUQTFTUEOS-UHFFFAOYSA-N |
| InChI | InChI=1S/C20H18N4.ClH/c1-12-8-17-19(10-15(12)21)24(14-6-4-3-5-7-14)20-11-16(22)13(2)9-18(20)23-17;/h3-11H,1-2H3,(H3,21,22);1H |
| PubChem CID | 2723800 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 32129000 |
| Tariff Code | 3212900000 |
Safety & GHS
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Corrosive
GHS05
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Health Hazard
GHS07
Hazard statements
- H315 Causes skin irritation
- H318 Causes serious eye damage
Precautionary statements
- 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
- P333+313 IF skin irritation or a rash occurs: Get medical advice/attention
- P337+313 If eye irritation persists 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.
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
- BASIC RED 2
- C.I. Basic Red 2
- Gossypimine
- Safranin
- Safranin T
- Safranine A
- Safranine O
- Safranine T
- Safranine TH
- Safranine Zh
Frequently asked questions
What is Safranine O used for?
Safranine O is primarily used as a biological stain in histology and as a dye in textile and paper industries.
What is the chemical formula and molecular weight of Safranine O?
The formula is C20H19ClN4 with a molecular weight of 350.84 g/mol.
How should Safranine O be stored?
Store at ambient temperature, away from light and moisture, in a tightly closed container.
What grade of Safranine O is available?
Molekula supplies Safranine O in analytical grade for laboratory use.
Can Molekula supply Safranine O in bulk?
Yes, Molekula can supply Safranine O in bulk quantities; please contact our sales team for pricing and availability.
What documentation comes with a Safranine O order?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS) compliant with GHS standards.
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.