Litmus pH indicator in acid and basic

Litmus pH indicator in acid and basic

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Credit: MARTYN F. CHILLMAID/SCIENCE PHOTO LIBRARY

Caption: Litmus pH indicator in acid (left) and base (right). Litmus is a water soluble mixture of dyes extracted from lichens. When used as a test, acids below pH 4.5 turn the dye red and bases above pH 8.3 turn the dye blue.

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Keywords: acid, alkali, base, basic, blue, chemical, chemistry, dye, extract, lichen, litmus, mixture, no-one, nobody, ph, ph indicator, red, school science, science education, test, test tubes, testing, water soluble, white background

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