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.
References in periodicals archive ?
While scientists know that most brilliant flower colors come from the pigment anthocyanin-which, like litmus paper, changes hue when subjected to acids or bases-they had not understood how sap in flower cells controls a petal's acidity.
John Harrington, 59, a sales manager, said: "I remember the litmus paper and how it changed colour.
Wresting it from my grasp he clouted me around the temples for a perceived misdemeanour, or more my disdain for the litmus paper test.
Precise pressure magnitude in psi or kg/cm2 can easily be determined by comparing color variations to a color correlation chart, conceptually similar to interpreting litmus paper.
You can buy litmus paper at a pharmacy to check the pH level.
And Meirionnydd Nant Conwy candidate Lisa Francis succeeded in giving that litmus paper the right kind of blue tinge.
Mr Tandy said: "It's like using a piece of litmus paper that can find out if matter is acidic but not how acidic it is.
It also offers me a twice a year litmus paper test of economic prosperity.
They can get a whiff of the musty scent by sniffing a piece of litmus paper soaked in her body essence which is held in a perspex box.
I start worrying about trace elements and wondering where I can buy test- tubes and litmus paper.
He slips a strip of litmus paper into a sample of lake water.