Catechol violet indicator, Sigma-Aldrich®

Supplier: SIGMA-ALDRICH MICROSCOPY
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Synonyms: Pyrocatechol Violet

M-Clarity™ quality level = MQ200

P7884-5G P7884-10G
P7884-5GEA 58.7 GBP
P7884-5G P7884-10G
Catechol violet indicator, Sigma-Aldrich®
Catechol violet

Pyrocatechol Violet (PV) is a sulfone phthalein dye. It chelates metal ions. The metal-PV complex is bluish-violet in colour.


  • Complexometric indicator
  • Pyrocatechol Violet has been used in the formation of dye-metal complexes
  • It has also been used to determine Cu²⁺ chelating activity

Formula: C₁₉H₁₄O₇S
MW: 386,38 g/mol
Melting Pt: 185 °C (dec., lit.)
Storage Temperature: Room Temperature
MDL Number: MFCD00005868
CAS Number: 115-41-3
EINECS: 204-088-3
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Specification Test Results

Appearance (Form) Powder
1H NMR Spectrum Conforms to Structure
Solubility (Colour), c = 10 mg/10 ml; Water Faint Brown to Brown and Faint Red to Dark Red
Suitability, Suitable for use as an indicator for EDTA titrations Suitable
Suitability, Suitable for use as a pH indicator Suitable

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