Historical clue formulations

• Ending with fluor- — 2012-12-22
• Suffix with opal — 2011-08-09
• Suffix with 1-Across — 2011-07-09
• Ending with fluor- — 2011-03-26
• Suffix with lumin- — 2010-09-26
• Suffix with opal — 2004-01-09
• Verb ending — 2004-01-02
• Suffix with opal — 2003-06-29
• Suffix with fluor- — 2002-12-12
• Suffix with fluor- — 2002-05-24
• Suffix with lumin- — 2000-11-17
• Suffix meaning "to become" — 1996-12-01
• Suffix with phosphor — 1996-04-28
• Suffix with opal — 1994-09-20