TURQUOISE.
| To | 1100 | lbs. | flint batch add |
| 90 | " | phosphate of lime, | |
| 15 | " | arsenic, | |
| 15 | " | calcined brass dust. | |
VIOLET.
| To | 100 | lbs. | flint batch add | |
| 1 | " | calcined brass, | ||
| 1 | ½ | " | zaffre. | |
Receipts for window-glass are as numerous as for flint. The following are in general use in England, so says Gillender:—
CROWN GLASS.
| Sand, | 1400 | lbs. |
| Quick lime, | 480 | " |
| Sulphate of soda, | 560 | " |
| Charcoal, | 25 | " |
PLATE GLASS.
| Sand, | 300 | lbs. |
| Sulphate of soda, | 450 | " |
| Quick lime, | 100 | " |
| Nitre, | 25 | " |
| Charcoal, | 5 | " |
DIAMOND GLASS.