litmus
(litīmәs)
a blue pigment prepared from Rocella tinctoria and other lichens.
litmus paper
absorbent paper impregnated with a solution of litmus, dried and cut into strips. It is used to indicate the acidity or alkalinity
of solutions. If dipped into alkaline solution it remains blue; acid solution turns it red. It is used to test urine and other
body fluids; it has a pH range of 4.5 to 8.3.

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