Historical clue formulations

• Flash — 2022-02-11
• Sparkle — 2019-08-13
• Twinkle — 2018-05-10
• Catch the light — 2016-04-20
• Subtle show of emotion in the eyes — 2011-07-13
• Flash — 2010-04-02
• Fleeting light — 2007-07-15
• Slight manifestation — 2004-12-19
• Flash of light — 2004-10-12
• Momentary flash — 2003-07-28
• Inkling — 2001-03-10
• Quick reflection — 2000-12-06
• Flash — 1996-12-01
• Sparkle — 1996-06-25
• Flash — 1994-06-24