| Mix: | |
| Feldspar | 139 |
| Whiting | 75 |
| Calcined Kaolin | 55 |
| Kaolin | 13 |
For colored glazes add to any of the above:
| Blue: | ||
| Cobalt Oxide | 3 parts | |
| Slate blue: | ||
| Cobalt Oxide | 3 parts | |
| Nickel Oxide | 1 part | |
| Warm blue: | ||
| Cobalt Oxide | 2 parts | |
| Iron Oxide | 1 part | |
| Green: | ||
| Copper Oxide | 8 parts | |
| Blue green: | ||
| Copper Oxide | 8 parts | |
| Cobalt Oxide | 1 part | |
| Cool green: | ||
| Copper Oxide | 8 parts | |
| Cobalt Oxide | 1 part | |
| Nickel Oxide | 2 parts | |
| Olive green: | ||
| Copper Oxide | 6 parts | |
| Iron Oxide | 4 parts | |
| Orange brown: | ||
| Iron Oxide | 8 parts | |
| Red brown: | ||
| Iron Oxide | 8 parts | |
| Chrome Oxide | 1 part | |
| Zinc Oxide | 3 parts | |
| Yellow: | ||
| Uranium Oxide | 3 parts | |
The coloring oxides should be weighed out and ground with the glaze. Any of the colors may be mixed together in order to modify the hue obtained or the amount of each coloring oxide may be varied to give a stronger or weaker value.
Opaque tin enamel.
| Cone .02 | ||||||
| PbO | .40 | } | ||||
| CaO | .25 | } | { | SiO2 | 1.75 | |
| K2O | .20 | } | Al2O3 .25 | { | SnO2 .30 | |
| ZnO | .15 | } |
| Mixture: | ||
| White Lead | 103 | |
| Whiting | 25 | |
| Feldspar | 111 | |
| Zinc Oxide | 12 | |
| Kaolin | 13 | |
| Flint | 27 | |
| Tin Oxide | 45 | |
| Grind, with one-half pint of water, for 45 minutes. | ||
PART V
The Defects of Glazes
While it may chance that body and glaze and fire are so adjusted that faults do not develop, this state of things is rare. Besides, it is always possible that an occasional trouble may arise, hence it will be well to recount a few of the commonest defects with the method of cure. A cure is not necessarily specific. There may be a complication of causes but the remedy indicates the line along which relief will be found.