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: [[Phenolphthalein]] is a [[transparent]] without colour when it is in a [[Neutral (Chemistry)|neutral]] [[solution]].
: [[Phenolphthalein]] changes colour quickly between [[pH]] 7 and 8 to turn pinky purple at [[pH]] 8 and beyond.
{| class="wikitable"
|+ Phenolphthalein pH scale.
|-
|[[File:PhenolphthaleinpHScale.png|center|600px]]
|-
|}