C16H24ClN3O3S
373.9 g/mol
Dye & PigmentWarning
Methylene Blue trihydrate
CAS7220-79-3
Category
Dye & Pigment
Compound Class
Heterocycle
Primary Use
Bacteriological stain and dye
Methylene blue trihydrate appears as odorless or almost odorless dark green crystals with bronze luster or dark green crystalline powder, with a pH of 3 to 4. 5 in a 1% aqueous solution.
Bacteriological stainRedox colorimetric agentAntimethemoglobinic agent in medicine
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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Biological stain and dye
StrongSame Parent
Methylene blue
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stain and dye agent
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Dye intermediate
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Fluorescent solvent dye
ReferenceSame Category
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Reactive dye for textile coloration
ReferenceSame Category
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Pigment for plastics
Safety Reference
Warning
H302Harmful if swallowed
H315Causes skin irritation
H319Causes serious eye irritation
H335May cause respiratory irritation
H373May cause damage to organs through prolonged or repeated exposure
Customs Tariff Classification
The international HS code for Methylene Blue trihydrate (CAS 7220-79-3) 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;trihydrate
InChIKey
XQAXGZLFSSPBMK-UHFFFAOYSA-M
SMILES
CN(C)C1=CC2=C(C=C1)N=C3C=CC(=[N+](C)C)C=C3S2.O.O.O.[Cl-]
Synonyms (27)
- Methylene blue (USP)
- 7220-79-3 (hdyrate)
- C.I. Basic Blue 9, trihydrate
- METHYLTHIONINE TRIHYDRATE
- Methylene Blue (C.I. 52015)
- Methylene Blue trihydrate
- Methylene blue
- Provayblue (TN)
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