This section is from the "Henley's Twentieth Century Formulas Recipes Processes" encyclopedia, by Norman W. Henley and others.
When the brick or tile leaves the press, with a very soft brush cover the part to be glazed with No. 1 Slip; afterwards dip the face in the same mixture.
Same clay as brick .. 9 parts
Flint.............. 1 part
Ball clay........... 5 parts
China............. 4 parts
Allow the brick to remain slowly drying for 8 to 10 hours, then when moist dip in the white body.
China clay......... 24 parts
Ball clay........... 8 parts
Feldspar........... 8 parts
Flint.............. 4 parts
The brick should now be dried slowly but thoroughly, and when perfectly dry dip the face in clean cold water, and immediately afterwards in glaze.
Feldspar........... 18 parts
Cornwall stone..... 3.5 parts
Whiting........... 1.5 parts
Oxide of zinc....... 1.5 parts
Plaster of Paris..... 3/4 part
White lead.......... 13 parts
Feldspar............ 20 parts
Oxide of zinc........ 3 parts
Plaster of Paris...... 1 part
Flint glass.......... 13 parts
Cornwall stone...... 3.5 parts
Paris white.......... 1.25 parts
Where clay is used that will stand a very high fire, the white lead and glass may be left out. A wire brush should now be used to remove all superfluous glaze, etc., from the sides and ends of the brick, which is then ready for the kiln. In placing, set the bricks face to face, about an inch space being left between the two glazed faces. All the mixtures, after being mixed with water to the consistency of cream, must be passed 2 or 3 times through a very fine 'lawn. The kiln must not be opened till perfectly cold.
Use color, 1 part, to white body, 7 parts. Use color, 1 part, to glaze, 9 parts.
 
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