what is litmus paper?
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Litmus paper is filter paper which has been treated with a natural water-soluble dye obtained from lichens. ... Blue litmus paper turns red under acidic conditions (pH below 4.5) while red litmus paper turns blue under alkaline conditions (pH above 8.3).
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The litmus paper is a water-soluble mixture of different dyes extracted from the lichens. This is used to test materials for acidity.
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