The glaze is ground for use.
The same glaze will also serve for stoneware but it will burn to a brilliant surface whereas stoneware is better when finished with a matt texture.
The following is a stoneware matt glaze:
| K2O | .3 | } | ||
| CaO | .7 | } | Al2O3 .7 | SiO2 2.6 |
Of which formula the mixture is—
| Feldspar | 167 |
| Whiting | 70 |
| Calcined Kaolin | 66 |
| Raw Kaolin | 26 |
| —— |
The porcelain glaze is at its best when uncolored. The matt glaze will be more interesting when used as a colored coating.
The following are a few suggestions for colored matt stoneware glazes. To the glaze batch, 329 parts, add:
| For blue: | |||
| Cobalt Oxide | 2 | parts | |
| Nickel Oxide | 1 | part | |
| Ground Rutile | 10 | parts | |
| For brown: | |||
| Iron Oxide | 6 | parts | |
| Nickel Oxide | 3 | parts | |
| Ground Rutile | 10 | parts | |
| For green: | |||
| Chrome Oxide | 2 | parts | |
| Cobalt Oxide | 1 | part | |
| Iron Oxide | 4 | parts | |
| For dark red: | |||
| Iron Oxide | 10 | parts | |
| Chrome Oxide | 2 | parts | |
| Zinc Oxide | 6 | parts |