Tags: Chemical Compound, Chemical Substance.

α-Naphtholphthalein (C28H18O4) is a pH indicator with a visual transition from colorless/reddish to greenish/blue at pH 7.3–8.7.

1-Naptholphthalein.svg
IUPAC name
33-bis(4-hydroxynaphthalen-1-yl)-2-benzofuran-1-one

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