Methylene blue (methylthioninium chloride) is a synthetic basic dye. It occurs as dark green crystals or powder with a bronze-like lustre, and its solutions in water or alcohol are deep blue. It is used to dye paper and office supplies, to tone silk colours and as a textile and leather dye. It is also used as a biological and bacteriological stain, as an indicator and as a reagent in oxidation-reduction titrations.
Full specification
- Molecular formula
- C16H18ClN3S
- Appearance
- Dark green crystals or powder with a bronze lustre
- Synonyms
- methylthioninium chloride
Compliance & regulatory
Region: EU — Chemotto S.r.l., Milano
- REACH-aligned supply
- CLP-labelled
REACH REACHRegistration, Evaluation, Authorisation and Restriction of Chemicals — the EU chemicals regulation (EC 1907/2006). CLP CLPClassification, Labelling and Packaging — the EU regulation (EC 1272/2008) for hazard communication. SVHC SVHCSubstance of Very High Concern — flagged on the REACH Candidate List for possible authorisation or restriction.
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