| Answer | Crossword Clue |
|---|---|
| ADAMANT | An unbreakable substance |
| ADAMANT | Unbreakable substance. |
| NACRE | Substance in an oyster |
| CENSE | Burn an aromatic substance |
| CORAL | Substance of an atoll. |
| GLUE | Substance on an envelope |
| CENSE | Burn, as an aromatic substance |
| PITH | Spongy substance in an orange. |
| PED | Illegal substance for an athlete: Abbr. |
| TAR | Substance used in an old punishment |
| CURARE | Resinous substance used as an arrow poison |
| TANNIN | Substance giving red wine an astringent taste |
