What indicators change from clear to colored?

Are there any acid/base indicators that are colorless in neutral solution and colourless in acidic or alkaline solutions?
Francis F.

Phenolpthalein turns from clear in neutral solution to pink in alkaline solution. An old trick is to pour a phenolpthalein solution into a cup containing a little sodium hydroxide; the result is an apparent transformation of 'water' into 'wine'.

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