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Why Is It Called a "Litmus Test"?

A litmus test is an idiom for a challenge. But why? In a 2024 New York Times piece exploring the controversy over married couples in Japan using separate surnames, the Times headline read: "A Litmus ...
WFAE

Trump verdict could be a litmus test for where Republican party is headed

Now, on the line, we've got NPR senior national political correspondent Mara Liasson. Hey, Mara. MARA LIASSON, BYLINE: Hi, Scott. DETROW: Let's pick up on that last point. You have been calling ...