Historical clue formulations

• Boil down — 2024-10-12
• Boil down — 2022-04-07
• Boil down — 2021-04-10
• Boil down — 2021-03-02
• Boil down — 2018-11-08
• Boil down — 2011-10-28
• Extract the essence of by boiling — 2011-10-14
• Make extracts from by boiling — 2003-10-30
• Obtain an extract of — 1999-09-19
• Boil down — 1994-10-22