Historical clue formulations

• Ceramics component — 2026-02-12
• ___ gel (moisture-absorbing stuff marked "Do not eat") — 2025-08-19
• Quartz compound — 2025-07-27
• ___ gel (drying agent that comes in small packets) — 2022-08-17
• Flint is a form of it — 2020-12-20
• Glass component — 2018-04-25
• Flint, e.g. — 2007-06-22
• Flint is a form of it — 2006-03-26
• Glass component — 2005-09-25
• Flint is a form of it — 2003-05-24
• Glass ingredient — 2001-05-15
• Quartz material — 1999-07-13
• Glass component — 1995-10-01
• Glass ingredient — 1994-04-18