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Phthalein dye

From Wikipedia, the free encyclopedia

Phthalein dye
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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.

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Chemical structure of phenolphthalein, a common phthalein dye

Common phthalein dyes include:

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See also

References

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