Crossword Genius

Chemical indicator (6)

Ross

I believe the answer is:

litmus

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">chemical indicator</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 "Acid-alkali testing substance" , "Acid/alkali test dye" , "Substance used to distinguish between acid and alkali" , "Paper used to test for acid or alkali" , "Colouring material used as a rough acid-base indicator" .)

I've seen this clue in The Times.
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