Historical clue formulations

• Autumn colours — 2018-06-05
• Earthy colors — 2017-10-11
• Earth tones — 2015-04-21
• Earthy tones — 2014-10-28
• Earth tones — 2009-05-27
• Canyon tones — 2008-06-27
• Orangish tones — 2007-12-20
• Colors in cave paintings — 2003-12-14
• Orangish hues — 2003-08-14
• Orangeish shades — 1999-04-26