Litmus solution added to acid

Litmus solution added to acid

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Caption: Litmus solution being added to an acid. Litmus is an indicator, a chemical that has a different colour depending on whether it is in an acidic or alkaline environment. In acids it is red. In alkalis it turns purple/blue. Litmus is derived from the lichen Lecanora tartarea. For litmus being added to an alkali, see image A500/483.

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Keywords: acid, acidic, acidity, chemical, chemistry, colour change, demonstration, experiment, indication, indicator, laboratory, litmus, ph, red, solution

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