| Clue | Source | Date |
|---|---|---|
| Silicon-based substance used in insulation | ||
| Confectionery set made of light material | ||
| Synthetic material also called frozen smoke | New York Times | 21 Aug 2021 |
| Foam, blood in meadow all around | ||
| Extremely light porous solid | Premier Sunday | 14 Jun 2020 |
| Extremely lightweight material | Universal | 22 Jul 2019 |
| Filth once dumped in meadow rising as foam | ||
| Extremely lightweight material | ||
| Skylight insulation material, perhaps | ||
| Skylight insulation material, perhaps | ||
| Superlight porous solid |