litmus paper

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litmus

 [lit´mus]
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.

litmus paper

[lit′məs]
Etymology: ONorse, litmosi, coloring herb; L, papyrus, paper
absorbent paper coated with litmus, a blue dye, that is used to determine pH. Acid substances or solutions turn blue litmus to red. Alkaline substances or solutions do not cause a color change in blue litmus. The pH range is 4.5 (red) to 8.5 (blue).

litmus paper

Chemically prepared blue paper that contains a hydrogen-ion sensitive dye, is turned red by acids, and remains blue in alkali solutions; pH range is 4.5 to 8.5.
See: indicator
See also: paper

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.