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What (who) is Litmus - definition
WATER-SOLUBLE MIXTURE OF DIFFERENT DYES EXTRACTED FROM LICHENS.
Litmus paper; Litmus Paper; Azolitmin; Erythrolein; Leucoorcein; Leucazolitmin; Litmus test (chemistry)
![Chemical structure of 7-hydroxyphenoxazone, the [[chromophore]] of litmus components](https://commons.wikimedia.org/wiki/Special:FilePath/7-hydroxyphenoxazone.svg?width=200 "Chemical structure of 7-hydroxyphenoxazone, the [[chromophore]] of litmus components")
![''[[Parmelia sulcata]]''](https://commons.wikimedia.org/wiki/Special:FilePath/Parmelia sulcata.jpeg?width=200 "''[[Parmelia sulcata]]''")
Litmus
·noun A dyestuff extracted from certain lichens (Roccella tinctoria, Lecanora tartarea, ·etc.), as a blue amorphous mass which consists of a compound of the alkaline carbonates with certain coloring matters related to orcin and orcein.
litmus
['l?tm?s]
¦ noun a dye obtained from certain lichens that is red under acid conditions and blue under alkaline conditions.
Origin
ME: from ON lit-mosi, from litr 'dye' + mosi 'moss'.
Litmus
Litmus is a water-soluble mixture of different dyes extracted from lichens. It is often absorbed onto filter paper to produce one of the oldest forms of pH indicator, used to test materials for acidity.
Wikipedia
Litmus
Litmus is a water-soluble mixture of different dyes extracted from lichens. It is often absorbed onto filter paper to produce one of the oldest forms of pH indicator, used to test materials for acidity. In an acidic medium, blue litmus paper turns red, while in a basic or alkaline medium, red litmus paper turns blue.
Examples of use of Litmus
1. McCLELLAN: The President doesn‘t have a litmus test. Some people want to impose a litmus test; the President does not believe there should be a litmus test for judges. A judge should rule based on the law.
2. McCLELLAN:В The President doesnt have a litmus test.В Some people want to impose a litmus test; the President does not believe there should be a litmus test for judges.В A judge should rule based on the law.
3. Football is the "litmus test" for any broadcaster‘s sports coverage.
4. Q: Sir, you‘ve already said there was no litmus test – THE PRESIDENT: Correct. And I‘ll say it again: There is no litmus test.
5. It is the litmus test for our graying, globalizing era, much as tax cuts and deregulation were the litmus tests a quarter of a century ago.