LITMUS
Set to 3 different clues across 3 published puzzles, most often “Blue coloring matter” — The New York Times, Saturday, 13 November 2004.
6 letters
Every clue on record, most used first
- Blue coloring matteronce
The New York Times — Saturday, 13 November 2004
- Kind of testonce
The New York Times — Thursday, 4 October 2001
- Kind of paper or testonce
The New York Times — Tuesday, 17 August 1999