Universal indicator paper for pH value is shown in use on a lemon with a pH value of approx. 2, and a piece of hand soap with a pH value of approx. 11

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Keywords: acid, alkaline, analysis, blue, change, chemistry, color, daily, demonstration, education, educative, experiment, fruit, grade, hand, indicator, laboratory, lemon, nature, objects, orange, paper, ph, ph-, school, science, scientific, soap, tutorial, universal, university