Cresol Red

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Cresol Red chemical structure
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Cresol Red chemical structure
  • Full name: o-Cresolsulfonephthalein
  • Molecular formula: C21H17NaO5S
  • Molecular mass: 404.41 g/mol
  • CAS number: 62625-29-0
  • MDL number: MFCD00001618
Cresol Red (pH indicator)
below pH 7.2 above pH 8.8
7.2 ↔ 8.8

As an indicator, it is frequently used for monitoring the pH in aquaria.


Cresol Red can also be used as a color marker to monitor the process of agarose gel electrophoresis and polyacrylamide gel electrophoresis. In a 1% agarose gel it runs approximately at the size of a 125 base pair (bp) DNA molecule. Bromophenol blue and xylene cyanol can also be used for this purpose.

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