Historical clue formulations

• Component of fertilizer and gunpowder — 2026-03-22
• Fireworks ingredient — 2024-11-24
• Gunpowder ingredient — 2024-01-14
• Crystalline mineral deposits in some caves — 2023-12-27
• Pyrotechnics compound — 2012-12-22
• Atacama Desert export — 2011-04-02
• KNO3 — 2006-12-29
• Munitions compound — 2006-12-08
• Gunpowder ingredient — 2005-09-11
• Gunpowder component — 2003-11-05
• Gunpowder ingredient — 2001-06-24
• Compound in fireworks — 2001-05-12
• Fertilizer ingredient — 1999-11-12
• Gunpowder ingredient — 1997-04-07
• Potassium compound — 1996-12-01
• KNO3 — 1995-08-22
• KNO3 — 1995-05-09