Historical clue formulations

• As, in chemistry — 2026-06-03
• Chemical element whose use led to the first known law against poisoning — 2026-02-15
• It once earned the nickname "poudre de succession" ("inheritance powder") — 2022-09-24
• As seen in chemistry class? — 2022-05-20
• "___ and Old Lace" (play and movie) — 2015-06-01
• Suspected cause of Napoleon's death — 2014-09-14
• #33 on a table — 2011-09-29
• Straight As in chemistry? — 2011-04-07
• Once-common pesticide component — 2011-02-08
• One of the metalloids — 2010-01-09
• As, chemically — 2009-07-27
• It's detected by the Marsh test, in forensics — 2006-05-06
• Poison in classic mysteries — 2003-10-06
• Cause of Philip Boyes's death in a Dorothy Sayers novel — 2002-10-20
• Elderberry wine additive, in a Kesselring play — 2000-01-02