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What is litmus?



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Litmus is a colored powder, obtained from certain lichens, that changes to red in an acid solution, and to blue in an alkaline solution. Litmus is a mixture of various closely related heterocyclic organic compounds. It is used to make litmus paper , which can be used to determine whether a solution is basic or acidic by dipping a strip of the paper into the solution and seeing how the paper changes color.