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The term litmus comes from an Old Norse word meaning "to dye or color." This is fitting since the lichens used to make litmus have also been used to dye cloth for hundreds of years.
The ability of litmus paper to change color when exposed to an acid or base is a result of litmus paper being infused with lichens.
Litmus paper will most certainly continue to be used extensively in education due to its reasonable cost and ease of use.
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