indicator (visual) 

https://doi.org/10.1351/goldbook.I03005
See: acid–base indicator, adsorption indicator, colour indicator, mixed indicator
Source:
Orange Book, 2nd ed., p. 48 [Terms] [Book]
Citation: 'indicator (visual)' 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.I03005 RIS BibTex EndNote
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Last revised: February 24, 2014