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English definition of “universal indicator”

universal indicator

noun [C]     specialized
a chemical solution made from a mixture of substances that produce many different colour changes according to different pH levels, used to discover how acid or alkaline something isTypes of chemicalSpecific chemicals, chemical compounds and gasesSubstances and structures in the body
(Definition of universal indicator noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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