C16H18ClN3S
319.9 g/mol
Dye & PigmentDanger
Methylene blue
CAS61-73-4EC200-515-2
Category
Dye & Pigment
Compound Class
Amine
Primary Use
stain and dye agent
Methylene blue is an organic chloride salt commonly used as a stain and dye agent, particularly in bacteriology and histology. It also exhibits antioxidant, antimalarial, antidepressant, and cardioprotective properties, and acts as a redox colorimetric indicator.
stain in bacteriology and histologytemporary hair coloranttextile, paper, and leather dye
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
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Related Compounds
StrongSame Parent
Methylene Blue trihydrate
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Bacteriological stain and dye
StrongSame Parent
Methylene blue trihydrate
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Biological stain and dye
ReferenceSame Category
O-tolidine dihydrochloride
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dye intermediate and reagent
ReferenceSame Category
3,3'-dichlorobenzidine dihydrochloride
CAS612-83-9
Intermediate for azo dyes and pigments
ReferenceSame Category
Solvent Red 212
CAS61300-98-9
solvent red dye
ReferenceSame Category
2,5-diaminotoluene sulfate
CAS615-50-9
Ingredient in hair dyes and fur dyes
Safety Reference
Danger
H302Harmful if swallowed
H318Causes serious eye damage
H412Harmful to aquatic life with long lasting effects
H361Suspected of damaging fertility or the unborn child
H370Causes damage to organs
H372Causes damage to organs through prolonged or repeated exposure
Customs Tariff Classification
The international HS code for Methylene blue (CAS 61-73-4) is 3204.13.
HS code (international, 6-digit)
3204.13
EU CN code (8-digit)
3204 13 00
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
Identifiers
IUPAC Name
[7-(dimethylamino)phenothiazin-3-ylidene]-dimethylazanium chloride
InChIKey
CXKWCBBOMKCUKX-UHFFFAOYSA-M
SMILES
CN(C)C1=CC2=C(C=C1)N=C3C=CC(=[N+](C)C)C=C3S2.[Cl-]
Synonyms (139)
- M-3598
- Chlorure de methylthioninium [INN-French]
- Cloruro de metiltioninio [INN-Spanish]
- Methylene Blue BP
- Methylene Blue USP (Medicinal)
- Methylene Blue USP XII (Medicinal)
- Methylene blue usp
- Methylthioninii chloridum [INN-Latin]
- Aizen Methylene Blue BH
- Aizen Methylene Blue FZ
- Azul Metile
- Basic blue 9
- Basic blue 9 trihydrate
- Bleu de methylene
- Blu di Metilene
- Blue 9, Basic
- Blue N, Methylene
- Blue, Methylene
- Blue, Swiss
- Blue, Urolene
- C.I. 52 015
- C.I. Basic Blue 9
- C.I. Basic Blue 9 trihydrate
- Calcozine Blue ZF
- Ceruleum methylenum
- Chlorure de methylthioninium
- Chromosmon
- Cloruro de metiltioninio
- Collubleu
- Colour Index No. 52015
- D And C Blue Number 1
- D and C Blue No. 1
- Desmoidpillen
- Ehrlichs reagent III
- Ext D and C Blue No. 1
- External Blue 1
- Leather Pure Blue HB
- Loeffler's Methylene Blue
- Lowacryl blue 9
- M-B Tabs
- Methylenblau
- Methylenblau [German]
- Methylene Blue (Medicinal)
- Methylene Blue 2B
- Methylene Blue 2BF
- Methylene Blue 2BN
- Methylene Blue 2BP
- Methylene Blue A
- Methylene Blue B
- Methylene Blue BB
- Methylene Blue BB (Zinc Free)
- Methylene Blue BBA
- Methylene Blue BD
- Methylene Blue BPC
- Methylene Blue BX
- Methylene Blue BZ
- Methylene Blue D
- Methylene Blue FZ
- Methylene Blue G
- Methylene Blue GZ
- Methylene Blue HGG
- Methylene Blue I (Medicinal)
- Methylene Blue IAD
- Methylene Blue INJ
- Methylene Blue JFA
- Methylene Blue N
- Methylene Blue NF (Medicinal)
- Methylene Blue NZ
- Methylene Blue SG
- Methylene Blue SP
- Methylene Blue ZF
- Methylene Blue ZX
- Methylene Blue Zinc Free
- Methylene Blue anhydrous
- Methylene Blue chloride
- Methylenium ceruleum
- Methylenum Caeruleum
- Methylenum coeruleum
- Methylthionine chloride
- Methylthionini chloridum
- Methylthioninii chloridum
- Methylthioninium chloride
- Methylthioninium chloride CRS
- Methylthioninium chloride RS
- Methylthionium chloride
- Metiltioninio cloruro
- Mitsui Methylene Blue
- Modr Methylenova [Czech]
- Modr Rozpoustedlova 8 [Czech]
- Modr Zasadita 9 [Czech]
- Modr methylenova
- Modr rozpoustedlova 8
- Modr zasadita 9
- Provayblue
- Rember
- Sandocryl Blue BRL
- Schultz No. 1038
- Solvent blue 8
- Swiss Blue
- Tetramethylene Blue
- Tetramethylthionine chloride
- Urolene blue
- Vitableu
- Yamamoto Methylene Blue B
- Yamamoto Methylene Blue ZF
- Zinc free Methylene Blue
- azul de metileno
- methylene blue
- methylthioninium chloratum
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