Methylene Blue
Also known as: Basic Blue 9, C.I. 52015, Methylthioninium Chloride, 3,7-Bis(dimethylamino)phenothiazin-5-ium chloride, Urolene Blue, Chromosmon, SWISS BLUE, abcolmethyleneblue2b
Methylene Blue (CAS 61-73-4) is a compound in the Organic Compounds category listed in the Jingsj chemical database. It has the molecular formula C16H18ClN3S and a molecular weight of 319.85200 g/mol. Key properties include a melting point of 190 °C (dec.)(lit.), a density of 1.0 g/mL at 20 °C and a flash point of 45 °C. It is classified under GHS with signal word Warning and hazard statements H226 — Flammable liquid and vapour. It is listed by 1 supplier; request a quote for pricing. Record last updated Aug 21, 2026.
- CAS No.
- 61-73-4
- Jingsj CID
- J-1094601-1
- Molecular Formula
- C16H18ClN3S
- Molecular Weight
- 319.85200 g/mol
- Category
- Organic Compounds
- Last updated
- 8/21/2026
| Supplier | Purity / Pack | Base Price | Unit Price | Origin | |
|---|---|---|---|---|---|
Made to Order | - | - | CN China |
Physicochemical Properties
| Melting Point | 190 °C (dec.)(lit.) |
|---|---|
| Density | 1.0 g/mL at 20 °C |
| Flash Point | 45 °C |
| Exact Mass | 319.09100 |
| PSA | 47.38000 |
| Additional Property | 40 g/L (20 ºC) |
GHS Safety & Compliance
- H226 — Flammable liquid and vapour
Activity & Biological Data
| Additional Information | [1]. Methylene blue, From Wikipedia |
|---|
Customs & Trade Information
| HS Code | 2934300000 |
|---|---|
| Summary | 2934300000. other compounds containing in the structure a phenothiazine ring-system (whether or not hydrogenated), not further fused. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0% |
Frequently Asked Questions
What is the CAS number of Methylene Blue?
The CAS number of Methylene Blue is 61-73-4.
What are the molecular formula and molecular weight of Methylene Blue?
Methylene Blue has molecular formula C16H18ClN3S and molecular weight 319.85200 g/mol.
Which suppliers offer Methylene Blue?
1 supplier(s) listed; request a quote for pricing.
Is Methylene Blue hazardous?
Methylene Blue has GHS signal word Warning and hazard statements H226 — Flammable liquid and vapour.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Methylene Blue (CAS 61-73-4)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1094601-1 (accessed 2026-11-07).
Data for reference only; verify product details with suppliers before purchase.