GLAZES
(See also Ceramics, Enamels, Paints, and Varnishes.)
Glazes For Cooking Vessels.
| Frit | 84 | 84 | 84 | 84 |
| Red lead | 1.5 | 1.5 | 1.5 | 1.5 |
| Gravel | 8 | 6 | 3 | ─── |
| Feldspar | ─── | 2 | 5 | 8 |
| Kaolin, burnt | 6.5 | 6.5 | 6.5 | 6.5 |
Glazes which are produced without addition of red lead to the frit, are prepared as follows. Melt a frit of the following composition: Red lead, 22.9 parts (by weight); boracic acid in crystals, 24.8 parts; enamel soda, 37.1 parts; calcined potash, 6.9 parts; cooking salt, 10 parts; chalk, 10 parts; gravel, 12 parts; feldspar, 8 parts.
From the frit the following glazes are prepared:
| Frit | 86.5 | 86.5 | 86.5 | 86.5 |
| Gravel | 7 | 4.5 | 3 | ─── |
| Feldspar | ─── | 2.5 | 4 | 7 |
| Kaolin, burnt | 6.5 | 6.5 | 6.5 | 6.5 |