Historical clue formulations

• ___ dye (chemical coloring) — 2021-03-23
• ___ dye — 2018-08-28
• Like some synthetic colorants — 2017-08-17
• Kind of dye with vivid colors — 2017-01-25
• Kind of dye — 2016-02-28
• Kind of dye — 2015-08-13
• ___ dye — 2014-11-25
• Kind of dye — 2014-07-18
• Type of dye — 2013-01-31
• Kind of dye — 2012-09-27
• Kind of dye — 2012-08-23
• Kind of dye — 2012-04-18
• Kind of compound in chemistry — 2011-12-30
• Kind of dye — 2011-06-16
• ___ dye — 2011-05-18
• ___ dye — 2010-10-12
• ___ dye — 2010-05-27
• ___ dye — 2008-12-17
• ___ dye — 2008-05-13
• ___ dye (chemical coloring) — 2008-01-28
• ___ dye — 2007-10-09
• ___ dye — 2006-10-14
• Kind of dye — 2006-10-07
• ___ dye — 2006-07-30
• Kind of dye — 2006-02-11
• Kind of dye — 2005-07-15
• Group of dyes — 2005-02-06
• Prefix with benzene — 2004-04-04
• Prefix with benzene — 2000-12-10
• ___ dye — 1999-12-09
• Prefix with benzene — 1998-11-28
• ___ dye (chemical coloring) — 1998-09-08
• Kind of dye — 1998-06-04
• ___dye — 1996-05-02
• Kind of dye — 1995-07-26
• _____ dye — 1995-07-16
• Type of dye — 1995-06-08
• Kind of dye — 1995-04-08
• Kind of dye — 1995-03-15
• Kind of dye — 1994-10-02
• Prefix with benzene — 1994-05-21