ALLOYS
| Date | Clue |
|---|---|
| 2023-11-04 | Bronzes, say |
| 2020-01-21 | Bronze and brass |
| 2019-05-14 | Sterling silver and such |
| 2016-04-24 | Subject in metallurgy |
| 2013-05-09 | Solder and others |
| 2008-09-13 | Electrum and others |
| 2004-06-21 | Bronze and stainless steel |
| 2001-11-05 | Metallic mixtures |
| 2001-08-08 | Sterling silver and others |
| 2001-05-06 | Cast iron and others |