When was this clue last seen?

This clue last appeared in the NYT Crossword on Tuesday, 25 January 2022.

It turns red litmus paper blue

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litmusturnspaper

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This clue appeared in the NYT Crossword on Tuesday, 25 January 2022. The answer BASE is a 4-letter entry.

This answer appears frequently in crosswords. View BASE answer history →

What is the answer to "It turns red litmus paper blue"?: BASE
How many letters is the answer to "It turns red litmus paper blue"?: The answer has 4 letters.
When was this clue last seen?: This clue last appeared in the NYT Crossword crossword on Tuesday, 25 January 2022.
Has this crossword clue appeared before?: Yes. Variations of this clue have appeared 19 other times.

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