07 March 2018

Litmus test


Litmus is a water-soluble mixture of different dyes extracted from lichens. The word comes from lytmos and Old Norse litmosi meaning dye-moss. The main use of litmus is to test whether a solution is acidic or basic. It is often absorbed onto filter paper to produce one of the oldest forms of pH indicator. Litmus turns red under acidic conditions and blue under alkaline conditions.

The more modern figurative use of the term "litmus test" is a situation in which you arrive at a conclusion based on a single factor, such as an attitude, event, or fact) is decisive. A headline such as "Eurozone Elections: Litmus Test for the EU" is an example of that usage.

1 comment:

  1. We absolutely love your blog and find nearly all of your post’s to be just what I’m looking for. I’ll bookmark your blog and check once more here regularly.
    I am quite sure I’ll be informed a lot of new stuff
    right right here! Best of luck for the next!

    ReplyDelete