Historical clue formulations

• Refine, as ore — 2023-12-11
• Get metal from, in a way — 2023-07-21
• Source of masago, in Japanese cuisine — 2023-04-08
• Extract from ore, as metal — 2022-07-13
• Refine, in a way — 2022-05-19
• Roe source — 2022-03-04
• Process, as ore — 2021-05-18
• Refine, in a way — 2020-11-26
• Refine, as metal — 2020-07-28
• Process, as ore — 2020-05-03
• Small silvery fish — 2019-11-19
• Refine — 2019-11-09
• Put through a blast furnace, say — 2018-11-05
• Fish whose roe is used in sushi — 2018-04-19
• Small food fish — 2017-12-25
• Refine — 2017-10-29
• *Extract with heat, in a way — 2017-05-31
• Rid of impurities — 2017-05-13
• Silvery fish — 2016-12-16
• Get the lead out? — 2016-05-07
• Great Lakes fish — 2016-01-23
• Refine, as ore — 2015-06-22
• Refine, as ore — 2014-07-22
• Take the lead from? — 2012-01-07
• Extract metals from by heating — 2011-07-11
• Process, as ore — 2011-04-12
• Remove impurities from — 2011-03-01
• Refine — 2009-04-03
• Great Lakes fish — 2009-02-12
• Get the lead out? — 2008-06-20
• Refine, as metal — 2005-03-22
• Refine, as metal — 2004-07-05
• Silvery food fish — 2004-04-06
• Fish eaten whole — 2003-12-25
• Get the lead out? — 2003-12-05
• Process, as ore — 2003-11-09
• Got a whiff of, old-style — 2003-10-21
• Refine — 2003-10-11
• Silvery fish — 2003-09-21
• Fuse ore — 2002-02-03
• Refine, as ore — 2000-08-30
• Refine, as metal — 2000-05-22
• Refine — 1999-04-29
• Fuse — 1999-03-14
• Put through a furnace — 1998-12-20
• Sensed odors, old-style — 1998-11-04
• Food fish — 1998-11-03
• Upriver spawner — 1998-08-09
• Troutlike fish — 1998-06-23
• Relative of the salmon — 1998-06-01