Historical clue formulations

• Rot — 2023-07-04
• Sour — 2022-11-25
• Turn — 2022-04-22
• Not keep — 2021-01-03
• Rot — 2019-09-17
• Become inedible — 2013-12-11
• Spoil — 2013-08-13
• Spoil — 2012-07-15
• Sprout mold, say — 2010-03-31
• Spoil — 2007-10-23
• Turn — 2006-02-22
• Become spoiled — 2005-08-03
• Spoil — 2004-08-11
• Spoil — 2003-10-27
• Rot — 1998-09-16
• Turn — 1995-05-25
• Become spoiled — 1995-05-24