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Phenolphthalein exposes basic liquids by turning them pink
HERE’S THE INTERESTING PART
Sitting completely clear and boring in acidic or neutral solutions, phenolphthalein dramatically reveals itself the second a liquid turns remotely basic by violently shifting into a shockingly bright pink hue. It acts as a chemical tattletale, irreversibly changing the aesthetic of an entire beaker just to signal a minor pH shift.
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