It happens to be Litmus.
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One indicator that turns red in acidic solutions is litmus paper. Litmus paper is blue in neutral solutions and turns red in acidic solutions due to a color change caused by a change in pH.
Litmus paper is an indicator that turns red in acidic solutions and blue in alkaline solutions.
Universal Indicator solution turns yellow in acidic solutions and red in strongly acidic solutions.
The universal indicator turns red in acidic solutions.
Litmus paper is a common indicator that turns red in acidic solutions and blue in alkaline solutions.
Universal indicator changes color in acidic or alkaline solutions due to variations in hydrogen ion concentration. In acidic solutions, it turns red/orange, and in alkaline solutions, it changes to blue/purple.