Crossword Genius

Kind of basic test (that turns red or blue) (6)


I believe the answer is:


(Other definitions for litmus that I've seen before include "This paper is used to test whether solution is acid or alkaline" , "Chemical indicator" , "A dye used as a rough indicator of acid" , "dye encountered in testing" , "Chemistry lab indicator" .)

I've seen this clue in The Guardian.
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