Grind.
Ruby.—
| Purple mixture | 2 1/2 parts |
| Rose mixture | 1 1/2 parts |
Grind.
Maroon.—
| Rose mixture | 1 part |
| Purple mixture | 2 parts |
Grind. {307}
Black—Extra quality.—
| Red oxide of iron | 12 parts |
| Carbonate of cobalt | 12 parts |
| Oxide of cobalt | 1 part |
| Black flux A (see next formula) | 80 parts |
Glost fire.