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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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