Historical clue formulations

• Part of a blues collection? — 2026-03-28
• Sky shade — 2025-11-22
• Sky blue — 2024-10-21
• Sky-blue — 2023-04-18
• Sky-blue — 2023-01-24
• Clear sky's color — 2022-02-01
• Relative of cerulean — 2021-09-19
• Beautifully blue — 2021-08-25
• Color whose name is derived from "lapis lazuli" — 2021-06-27
• Lapis lazuli shade — 2020-03-01
• Heraldic hue — 2019-10-05
• Sky hue — 2019-10-01
• Bright blue — 2018-12-19
• Sky-blue — 2018-12-03
• Sky-blue — 2018-05-13
• Blue hue — 2017-02-12
• Relative of cerulean — 2015-04-26
• Sky-blue — 2015-01-12
• Sky-blue — 2014-09-01
• Like good water for snorkeling — 2013-03-24
• Sapphire alternative — 2013-01-04
• Bright blue — 2011-12-13
• Sky-blue — 2011-12-12
• Sky-blue — 2010-12-27
• Fair-weather hue — 2010-02-03
• Like a clear sky — 2009-11-25
• Color of a picture-postcard sky — 2009-09-28
• Like a clear sky — 2009-02-18
• Sky-blue — 2009-01-12
• Like lapis lazuli — 2008-12-17
• Sky-blue — 2008-12-15
• Sky hue — 2008-09-08
• Sky-blue — 2008-02-25
• Sky-blue — 2007-04-23
• Sky-blue — 2006-12-18
• Blue hue — 2006-01-26
• "Main" color in "Rule, Britannia" — 2005-11-19
• Shade of blue — 2005-06-07
• Blue shade — 2005-05-23
• Like some skies — 2003-01-02
• Lapis lazuli — 2002-03-06
• Pretty blue — 2001-03-15
• Sky-blue — 2001-02-13
• Heraldic hue — 2000-06-16
• Sky-blue — 2000-04-11
• Like Shelley's "sister of the spring" — 1999-08-08
• Common color in heraldry — 1999-05-21
• Sky-blue — 1997-11-10
• Sky-blue — 1997-02-10
• Sky-blue — 1996-12-02