litmus /lit·mus/ (lit´mus) a pigment prepared from Rocella tinctoria and other lichens; used as an acid-base (pH) indicator.
lit·mus (l t m s)n. A water-soluble blue powder derived from lichens that changes to red with increasing acidity and to blue with increasing basicity. |
litmus
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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