the.com/litmus
The dye that turns personality into a yes-or-no question.
means A litmus test is a single, simplifying check — often a pH-indicating dye in chemistry, or a one-issue stand-in for a whole worldview in politics — used to sort things (or people) into clear-cut categories.
from From Scandinavian roots — Old Norse 'litmosi,' a moss used to make dye ('lita' = to dye, 'mosi' = moss). Lichens were boiled down into pigment that chemists later found changed color with acidity, turning a dyer's moss into chemistry's go-to yes/no test, and eventually into English's favorite metaphor for any single, decisive marker.
- origin
- Extracted from lichens, not synthetic chemistry
- mechanism
- Red in acid, blue in base, nothing in between
- politics
- Litmus test now means ideological purity check
- irony
- Real litmus tolerates a wide pH gray zone