Historical clue formulations

• Far from basic — 2026-07-12
• Like pickles, but not cucumbers — 2026-02-22
• Opposite of basic, in chemistry — 2024-01-01
• Hardly basic — 2023-01-12
• By no means basic — 2022-05-18
• Like apples and oranges — 2022-01-15
• Like vinegar — 2021-01-25
• Like vinegar — 2020-05-25
• Low-pH — 2020-01-26
• Cutting — 2017-02-18
• Very harsh — 2014-08-01
• Sour — 2014-06-12
• Like citrus fruits — 2013-09-22
• Vinegary — 2008-05-13
• Sharp — 2008-01-19
• Like sour grapes — 2001-01-18
• Not basic — 1997-06-12
• Tart — 1995-11-27