Title: colour indicator
Long Title: IUPAC Gold Book - colour indicator
DOI: 10.1351/goldbook.C01180
Status: current

Definition
An indicator which is classified as one- or two-colour, depending on whether it is colourless on one side of the transition interval or possesses a different colour on each side of this range.

Related Terms
- acid–base indicator: https://goldbook.iupac.org//terms/view/A00075
- adsorption indicator: https://goldbook.iupac.org//terms/view/A00162
- mixed indicator: https://goldbook.iupac.org//terms/view/M03942

Source
- Orange Book, 2nd ed., p. 48 (https://media.iupac.org/publications/analytical_compendium/)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/C01180/html
- json: https://goldbook.iupac.org/terms/view/C01180/json
- xml: https://goldbook.iupac.org/terms/view/C01180/xml

Citation: Citation: 'colour indicator' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.C01180
License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms.
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Disclaimer: The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using.
Accessed: 2026-06-06T16:49:55+00:00