FREON
Set to 10 different clues across 11 published puzzles, most often “DuPont trademark” — The New York Times, Saturday, 14 January 2006.
5 letters
Every clue on record, most used first
- DuPont trademark2 times
The New York Times — Saturday, 14 January 2006
- Ozone damageronce
The New York Times — Saturday, 12 September 2009
- Air-conditioning gasonce
The New York Times — Monday, 16 February 2009
- Damager of the ozone layeronce
The New York Times — Sunday, 27 January 2008
- Fluorine/carbon compoundonce
The New York Times — Thursday, 9 February 2006
- Aerosol gasonce
The New York Times — Wednesday, 28 December 2005
- Obsolescent refrigerantonce
The New York Times — Sunday, 5 December 2004
- Common refrigerantonce
The New York Times — Tuesday, 23 July 2002
- Refrigerator gasonce
The New York Times — Monday, 27 November 2000
- Commercial fluorocarbononce
The New York Times — Saturday, 16 January 1999