Historical clue formulations

• Chemical that speeds up a fruit's aging process — 2026-04-27
• Ethylene gas, to tomatoes — 2024-04-21
• It might change color — 2015-01-02
• Aging agent — 2002-08-30
• Ethylene gas, agriculturally — 1998-02-07
• Ethylene, e.g. — 1997-01-25