Crossword Genius

Kind of test (6)

Ross

I believe the answer is:

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">kind of test</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(Other definitions for litmus that I've seen before include "Paper used to test for acid or alkali" , "dye encountered in testing" , "Substance used in test for acidity" , "Material from lichens used to test for acidity" , "Chemical tester" .)

I've seen this clue in the Penny Press and The New York Times.
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