Historical clue formulations

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