Historical clue formulations

• Rose gold, e.g. — 2023-04-09
• Bronze, e.g. — 2020-05-02
• Alnico or chromel — 2019-09-29
• Alnico, e.g. — 2019-08-28
• Combine — 2019-03-07
• Bronze, but not silver or gold — 2018-05-16
• Cupronickel, e.g. — 2016-12-25
• Brass or bronze — 2015-07-22
• Many a filling material — 2013-06-14
• Dental gold, e.g. — 2013-04-13
• Amalgam, e.g. — 2012-07-25
• Bronze, e.g. — 2011-07-10
• Amalgam, e.g. — 2009-02-05
• Cast iron, e.g. — 2008-10-19
• Fusion — 2004-07-09
• Metallurgist's creation — 2004-04-28
• Brass or pewter — 2004-04-27
• Cast iron, e.g. — 2002-11-03
• Mix — 2002-06-02
• Fusion — 2002-01-19
• Pewter or brass — 2001-02-26
• Amalgam — 1999-05-04
• Mix, in a way — 1998-03-08
• Cupronickel, e.g. — 1998-01-25
• Brass or bronze — 1998-01-07
• Solder, e.g. — 1997-07-12
• Fusible metal — 1995-11-21