ALK
Set to 2 different clues across 2 published puzzles, most often “Litmus bluer: Abbr.” — The New York Times, Wednesday, 22 June 2005.
3 letters
Every clue on record, most used first
- Litmus bluer: Abbr.once
The New York Times — Wednesday, 22 June 2005
- Chemical base: Abbr.once
The New York Times — Monday, 27 September 2004