And the final mix for the glaze will be:
| Fritt | 134 parts |
| White Lead | 77 " |
| Zinc Oxide | 12 " |
| Feldspar | 26 " |
| Kaolin | 13 " |
| Flint | 67 " |
This is ground on the mill as already directed and is ready for use.
Fritted glazes are better than raw glazes for certain classes of ware. They are usually whiter and less easily scratched. They are, moreover, better for use with underglaze colors and are, as a rule, more easily melted. It is never necessary to make a fritt for the preparation of matt glazes.
PART IV
Recipes
While the purpose of this work is not so much to put ready-made materials into the hands of the craftsman as to enable him to work out his own plans, it is recognized that there are some workers who lack the training and even the patience to do this. For these, the following recipes are given, but with the proviso that no recipe can be regarded as perfect for all conditions. Just as an untrained cook can spoil a dinner even when surrounded by cookery books, so the best of recipes will fail when unskillfully treated. One must be prepared to recognize the faults which are sure to develop and to correct them in an intelligent manner. The previous chapters should therefore be carefully studied, not alone for the information but because "the joy of the working" depends greatly upon the knowledge one has of the operations involved and a modest confidence in one's own powers.
1. Bright raw glaze.
| Cone .06 | ||||||
| PbO | .60 | } | ||||
| CaO | .25 | } | Al2O3 | .15 | SiO2 | 1.45 |
| K2O | .15 | } | ||||
| Mix: | ||||||
| White Lead | 155 | |||||
| Whiting | 25 | |||||
| Feldspar | 55.7 | |||||
| Kaolin | 13 | |||||
| Flint | 45 | |||||
| Grind, with one-half pint of water, for one hour. | ||||||
2. Bright raw glaze.
| Cone 1 | |||||
| PbO | .45 | } | |||
| ZnO | .15 | } | Al2O3 .20 | SiO2 | 1.60 |
| CaO | .25 | } | |||
| K2O | .15 | } |