A dyestuff extracted from certain lichens, that changes color when exposed to pH levels greater than or less than certain critical levels.
2
A simple test of acidity in a liquid using litmus, usually in the form of litmus paper.
3
A simple test of any attribute; a litmus test.
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Idioms & Phrases
Example Bank
3
01
When investigating the pH (acidic, neutral, alkaline) of a liquid, don't soak the litmus paper completely in the liquid but just put the end of the paper in it.
Tatoeba · #329453
02
Since primary school we've been checking for the qualities known as acidity and alkalinity with litmus paper.
Tatoeba · #329454
03
These elections will be a litmus test for the government.