Historical clue formulations

• Onetime pickling liquid — 2012-02-10
• Sour condiment — 2008-08-30
• Sour brew — 2008-01-30
• Sour, fermented liquid — 2007-01-27
• Sour brew — 1998-05-25
• Londoner's sour brew — 1996-10-11
• Sour brew — 1994-09-12