Litmus paper

water-soluble mixture of different dyes extracted from lichens.

Litmus paper is a way to test whether or not a solution is alkaline or an acidic.

Litmus paper being used

Litmus is a solution of different dyes made from lichen. This is then put onto filter paper. The paper can then be used to give a rough indication of the pH value of a solution. Blue litmus paper will turn red, when acid is present; red litmus paper will turn blue when alkalines are present. At room temperature, this usually happens for PH values between 4.5 and 8.3.

Alternatively, a solution can be prepared which works the same way, but does not need the paper.

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