| Clue | Source | Date |
|---|---|---|
| With 42-Across, corrosive substances | The Washington Post | 13 Sep 2019 |
| With 42-Across, corrosive substances | LA Times Daily | 13 Sep 2019 |
| With 42-Across, corrosive substances | ||
| Acid variety | Universal | 26 Jun 2018 |
| Acid variety | ||
| Kind of acid | ||
| Type of acid | ||
| Like gunpowder | ||
| Kind of acid |