Cresol Red

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Cresol Red
Systematic name
Chemical formula	C21H17NaO5S
Molecular mass	404.41 g/mol
Density	x.xxx g/cm³
Melting point	xx.x °C
Boiling point	xx.x °C
CAS number	62625-29-0
SMILES
Disclaimer and references

Cresol Red (pH indicator)
below pH 7.2		above pH 8.8
7.2	↔	8.8

Cresol Red (full name: o-Cresolsulfonephthalein) is a triarylmethane dye frequently used for monitoring the pH in aquaria.

Cresol Red can be used in many molecular reactions instead of water. For example restriction digestion or PCR.

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.