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noun
An indicator that changes color on going from acidic to basic solutions.
is a specific kind of: indicator.
is a broader term that covers: phenolphthalein | congo red | methyl orange | litmus, litmus test | bromophenol blue, bromphenol blue, tetrabromo-phenolsulfonephthalein | bromothymol blue, bromthymol blue.
Find more on acid-base indicator elsewhere: etymology - rhymes - Wikipedia.
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