Historical clue formulations

• Non-eco-friendly refrigerant — 2026-04-18
• Trademarked refrigerant — 2025-07-27
• Trademarked refrigerant — 2023-02-26
• Refrigerator compound — 2021-01-18
• Air-conditioning coolant — 2019-10-30
• Gas once used in aerosols — 2019-02-15
• It has a chilling effect — 2017-02-18
• Compound under control by the Kyoto Protocol — 2016-11-10
• Ozone menace — 2014-04-12
• Kind of compressor — 2013-11-09
• Common cooler — 2012-12-15
• Ozone damager — 2009-09-12
• Air-conditioning gas — 2009-02-16
• Damager of the ozone layer — 2008-01-27
• Fluorine/carbon compound — 2006-02-09
• DuPont trademark — 2006-01-14
• Aerosol gas — 2005-12-28
• DuPont trademark — 2005-09-16
• Obsolescent refrigerant — 2004-12-05
• Common refrigerant — 2002-07-23
• Refrigerator gas — 2000-11-27
• Commercial fluorocarbon — 1999-01-16