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It turns red in acid Crossword Clue

6 letters · New York Times · Tuesday, May 8, 2012 · 49-Down

Appeared in 1 New York Times Crossword: Tuesday, May 8, 2012.

Exact puzzle match · New York Times · May 8, 2012 · 49-Down · 6 letters

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What does this clue mean?

a coloring material (obtained from lichens) that turns red in acid solutions and blue in alkaline solutions; used as a very rough acid-base indicator

noun

WordNet® (Princeton University)

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It turns red in acid Crossword Clue (6 Letters) | CrosswordAlly