halochromism

https://doi.org/10.1351/goldbook.H02725
The colour change which occurs on addition of @[email protected] (or @[email protected], or a @[email protected]) to a solution of a compound. A @[email protected] (e.g. ion formation) transforms a colourless compound into a coloured one.
Source:
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1119 [Terms] [Paper]