A halochromic material is a material which changes colour when pH changes occur. The term ‘chromic’ is defined as materials that can change colour reversibly with the presence of a factor. In this case, the factor is pH. The pH indicators have this property. Halochromic substances are suited for use in environments where pH changes occur frequ...
Found on http://en.wikipedia.org/wiki/Halochromism


Halochromism means the colour change which occurs on addition of acid (or base, or a salt) to a solution of a compound. A chemical reaction (e.g. ion formation) transforms a colourless compound into a coloured one. FALBE and REGITZ (1990); REICHARDT, ASHARIN-FARD, and SCHÄFER. (1993).
Found on http://www.chem.qmul.ac.uk/iupac/gtpoc/H.html
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