Molekula
Methylene blue
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
Methylene blue is a heterocyclic aromatic compound used as a dye, biological stain, and pharmaceutical agent, particularly in treating methemoglobinemia and as a diagnostic tool. It is available in powder form with a CAS number of 61-73-4, molecular formula C16H18ClN3S, and molecular weight of 319.85 g/mol. Stored at ambient temperatures, it carries a warning signal word due to potential hazards. Molekula supplies Methylene blue 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
Pack sizes & pricing
Pricing on request — packs available from research to bulk quantities.
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 | Brown red powder |
| Water | ≤5% |
| Solubility | ≥30 g/l @80℃ |
| Strength | 97% - 103% |
| Insoluble Content | ≤4% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Acid |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Odour | Slight odor |
| Melting Point | 100 to 110 °C (with decomposition) |
| Water Solubility | Soluble in water |
| Solubility (other solvents) | Soluble in ethanol, chloroform; slightly soluble in pyridine; insoluble in ethyl ether |
| Vapour Pressure | 0.00000013 mmHg |
Source: PubChem CID 6099 (HSDB, DrugBank, Haz-Map)
Identification
| Property | Value |
|---|---|
| SKU | 90035987 |
| CAS Number | 61-73-4 |
| IUPAC Name | [7-(dimethylamino)phenothiazin-3-ylidene]-dimethylazanium chloride |
| EC Number | 200-515-2 |
| Molecular Formula | C16H18ClN3S |
| Molecular Weight | 319.85 |
| Exact Mass | 319.091 |
| SMILES | CN(C)C1=CC2=C(C=C1)N=C3C=CC(=[N+](C)C)C=C3S2.[Cl-] |
| InChIKey | CXKWCBBOMKCUKX-UHFFFAOYSA-M |
| InChI | InChI=1S/C16H18N3S.ClH/c1-18(2)11-5-7-13-15(9-11)20-16-10-12(19(3)4)6-8-14(16)17-13;/h5-10H,1-4H3;1H/q+1;/p-1 |
| PubChem CID | 6099 |
| REACH Code | Y110 |
| HTS Code | 32129000 |
| Tariff Code | 3212900000 |
Safety & GHS
-
Health Hazard
GHS07
-
Serious Health Hazard
GHS08
Hazard statements
- H302 Harmful if swallowed
- H315 Causes skin irritation
- H319 Causes serious eye irritation
- H361 Suspected of damaging fertility or the unborn child
- H373 May cause damage to organs through prolonged or repeated exposure
- H413 May cause long lasting harmful effects to aquatic life
Precautionary statements
- P261 Avoid breathing dust/fume/gas/mist/vapours/spray
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P301+312 IF SWALLOWED: Call a POISON CENTER or doctor/physician if you feel unwell
- 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
- Basic blue 9
- C.I. Basic Blue 9
- Chromosmon
- Methylene Blue anhydrous
- Methylene Blue BB
- Methylene Blue N
- Methylthioninium chloride
- Solvent blue 8
- Swiss Blue
- Urolene blue
Frequently asked questions
What is methylene blue used for?
Methylene blue is commonly used as a dye in biological staining, a reagent in redox reactions, and in medical applications such as treating methemoglobinemia.
What is the chemical formula and molecular weight of methylene blue?
The formula is C16H18ClN3S and the molecular weight is 319.85 g/mol.
How should methylene blue be stored?
Store at ambient temperature, protected from light and moisture.
What grade of methylene blue does Molekula supply?
Molekula supplies methylene blue in analytical grade.
Can Molekula supply methylene blue in bulk?
Yes, Molekula can supply methylene blue in bulk quantities—please contact our sales team for details.
What documentation comes with a methylene blue order?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS).
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.