Chapter XXII: 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 Formula

PbO .60 }
CaO .25 } Al_{2}O_{3} .15 SiO_{2} 1.45
K_{2}O .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 Formula

PbO .45 }
ZnO .15 } Al_{2}O_{3} .20 SiO_{2} 1.60
CaO .25 }
K_{2}O .15 }

Mix:
White Lead 116
Whiting 25
Zinc Oxide 12
Feldspar 83
Kaolin 13
Flint 36

3. Bright fritted glaze.
Cone .02 Formula

PbO .25 }
ZnO .15 } Al_{2}O_{3} .15 }
CaO .30 } } SiO_{2} 2.35
Na_{2}O .20 } B_{2}O_{3} .30 }
K_{2}O .10 }

Mix:

Fritt Glaze

Borax 114 Fritt 117
Whiting 60 White Lead 64
Soda Ash 10 Zinc Oxide 12
Spar 56 Spar 28
Flint 78 Kaolin 13
Flint 60

Grind as before.

4. Matt glaze.
Cone .02 Formula

PbO .50 }
CaO .30 } Al_{2}O_{3} .34 SiO_{2} 1.48
K_{2}O .20 }

Mix:
White Lead 129
Whiting 30
Spar 111
Calcined Kaolin 22
Kaolin 11

5. Matt glaze.
Cone 7 Formula

CaO .75 } Al_{2}O_{3} .55 SiO_{2} 2.10
K_{2}O .25 }

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 Formula

PbO .40 }
CaO .25 } { SiO_{2} 1.75
K_{2}O .20 } Al_{2}O_{3} .25 { SnO_{2} .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.