Universal indicator
Indicator that works over a wide range of pH / From Wikipedia, the free encyclopedia
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This article is about the chemical pH indicator. For the musical artists, see Universal Indicator (collective).
A universal indicator is a pH indicator made of a solution of several compounds that exhibit various smooth colour changes over a wide range pH values to indicate the acidity or alkalinity of solutions. A universal indicator can be in paper form or present in a form of a solution.[1]