| Clue | Source | Date |
|---|---|---|
| Bluish-gray shades | New York Times | 20 Mar 2022 |
| Tin alloys | LA Times Daily | 03 Oct 2018 |
| Tin alloys | The Washington Post | 03 Oct 2018 |
| Tin alloys | ||
| Some metalware items | Universal | 27 Apr 2015 |
| Tin alloys | New York Times | 20 Mar 2015 |
| Tin alloys | ||
| Some metalware items | ||
| Tin alloys | ||
| Some metalware | ||
| Certain alloys | ||
| Alloys | ||
| Certain alloys. |