Historical clue formulations

• Space blanket material — 2025-10-09
• Balloon material — 2025-02-13
• Shiny balloon material — 2023-09-03
• Shiny balloon material — 2021-07-23
• Reflective material — 2013-09-29
• Solar sails material — 2010-02-28
• Insulation material — 2001-10-26
• Film used for recording tapes — 1997-08-10