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Credit: Phil Degginger/SCIENCE PHOTO LIBRARY

Caption: PH effect on methyl red indicator solution. Methyl red is an indicator dye that turns red in acidic solutions.

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Keywords: acid, acidic, acidity, alkali, azobenzene carboxylic acid, base, basic, c.i. acid red 2, chemistry, comparing, comparison, effect, experiment, indicator, methyl red, neutral, ph, red, solution

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