Phthalein dye
![](http://upload.wikimedia.org/wikipedia/commons/thumb/f/fa/Phenolphthalein.svg/220px-Phenolphthalein.svg.png)
Chemical structure of phenolphthalein, a common phthalein dye
Phthalein dyes are a class of dyes mainly used as pH indicators, due to their ability to change colors depending on pH.[1] They are formed by the reaction of phthalic anhydride with various phenols. They are a subclass of triarylmethane dyes.
Common phthalein dyes include:
References[]
- ^ Sabnis, Ram W. (2010). "Phthalein Dyes". Kirk-Othmer Encyclopedia of Chemical Technology. doi:10.1002/0471238961.phthsabn.a01. ISBN 978-0471238966.
Categories:
- Triarylmethane dyes
- Phthalides
- Organic compound stubs