| Clue | Source | Date |
|---|---|---|
| Gunpowder ingredient | Wall Street Journal | 16 Mar 2024 |
| Common name for potassium nitrate | New York Times | 22 Apr 2023 |
| Compound used as an oxidizer in fireworks | The Washington Post Sunday | 14 Oct 2018 |
| Gunpowder ingredient | Wall Street Journal | 17 Aug 2015 |
| Gunpowder ingredient | ||
| Gunpowder ingredient | ||
| Gunpowder ingredient | ||
| Gunpowder ingredient | ||
| Gunpowder compound | ||
| Gunpowder ingredient | ||
| Gunpowder component | ||
| Naturally occurring potassium nitrate | ||
| Gunpowder ingredient | ||
| Niter. | ||
| Chilean export. |