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.