acid–base indicator 

https://doi.org/10.1351/goldbook.A00075
An acid or base which exhibits a colour change on neutralization by the basic or acidic titrant at or near the equivalence point of a titration.
Source:
Orange Book, 2nd ed., p. 48 [Terms] [Book]
Citation: 'acid–base indicator' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.A00075 RIS BibTex EndNote
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Last revised: February 24, 2014