Historical clue formulations

• Chestnut — 2015-10-24
• Horse color — 2010-03-22
• Light reddish-brown — 2007-08-25
• Equine color — 2007-05-01
• Horse of a certain color — 2006-11-16
• Light reddish-brown — 2005-01-01
• Reddish brown — 2004-02-22
• Brownish-orange — 2003-02-27
• Buckwheat plant — 1995-06-02
• Horse color — 1994-08-30
• Light brown — 1994-02-20