Dyes that can be used as pH indicators Crossword Clue
9 letters · New York Times · Sunday, May 17, 2020 · 34-Across
Appeared in 1 New York Times Crossword: Sunday, May 17, 2020.
Exact puzzle match · New York Times · May 17, 2020 · 34-Across · 9 letters
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What does this clue mean?
a red-brown azo dye especially as a chemical pH indicator (congo red is red in basic and blue in acidic solutions)
noun
WordNet® (Princeton University)
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