| Answer | Crossword Clue |
|---|---|
| POTASH | Salt used in making glass. |
| POTARCH | Kiln used in glass making. |
| FRIT | Substance used in glass-making. |
| SILICA | It's used in making glass |
| PHOSGENE | Gas used in making glass and plastics |
| FRIT | Partly fused mixture in glass-making. |
| FRIT | Partly fused substance in glass making. |
