p-Naphtholbenzein is primarily used as a pH indicator in chemical analysis where it changes color from yellow to pink based on the acidity or alkalinity of a solution.

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p-Naphtholbenzein is an organic compound with the chemical formula CHO. It is a synthetic dye and a derivative of naphthalene commonly used in chemical analysis and as a pH indicator. The compound changes color depending on the pH of the solution it is in transitioning from yellow to pink as the pH decreases (becomes more acidic). Due to its ability to undergo such color changes it is sometimes used in laboratory settings to visually indicate pH levels.