Calcine and grind.
Blue Stains.—
| I.— | Oxide of cobalt | 2 1/2 parts |
|---|---|---|
| Oxide of zinc | 7 1/2 parts | |
| Stone | 7 1/2 parts | |
| Fire this very hard. | ||
| II.— | Zinc | 6 pounds |
| Flint | 4 pounds | |
| China clay | 4 pounds | |
| Oxide of cobalt | 5 ounces | |
| Hard fire. | ||
| III.— | Whiting | 3 3/4 parts |
| Flint | 3 3/4 parts | |
| Oxide of cobalt | 2 1/2 parts | |
Glost fire.
Turquoise Stain.—
| Prepared cobalt | 1 1/2 parts |
| Oxide of zinc | 6 parts |
| China clay | 6 parts |
| Carbonate of soda. | 1 part |
Hard fire.
Materials:
Tin Ash.—
| Old lead | 4 parts |
| Grain tin | 2 parts |