| Answer | Crossword Clue |
|---|---|
| SILICA | Ingredient of glass |
| FRIT | Ingredient of glass |
| FRIT | Ingredient of glass. |
| SILICA | Glass ingredient |
| SAND | Glass ingredient |
| FRIT | Glass ingredient |
| SILEX | Glass ingredient |
| SILICONDIOXIDE | Glass ingredient |
| SILEX | Glass ingredient, sometimes |
| TIN | Window-glass ingredient |
