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litmus British & World English

A dye obtained from certain lichens that is red under acid conditions and blue under alkaline conditions

litmus test British & World English

A test for acidity or alkalinity using litmus

litmus paper British & World English

Paper stained with litmus which is used to indicate the acidity or alkalinity of a substance. Blue litmus paper turns red under acid conditions, and red litmus paper turns blue under alkaline conditions