Litmus solution added to alkali

Litmus solution added to alkali

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Credit: ANDREW LAMBERT PHOTOGRAPHY/SCIENCE PHOTO LIBRARY

Caption: Litmus solution being added to an alkali. Litmus is an indicator, a chemical that has a different colour depending on whether it is in an acidic or alkaline environment. In alkalis it is purple/blue. In acids it turns red. Litmus is derived from the lichen Lecanora tartarea. For litmus being added to an acid, see image A500/482.

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Keywords: acidity, alkali, alkaline, chemical, chemistry, colour change, demonstration, experiment, indication, indicator, laboratory, litmus, ph, purple, solution

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