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Qué (quién) es litmus paper - definición
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 paper
¦ noun paper stained with litmus, used as a test for acids or alkalis.
Erythrolein
·noun A red substance obtained from litmus.
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.
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.
Ejemplos de uso de litmus paper
1. You can imagine the swan as a piece of litmus paper.
2. The subprime market that the press keeps grousing about is a market developed by a long line of American financial brokers, abetted by rating agencies, which are supposed to be the litmus paper of common sense in financial circles.