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Updated: May 25, 2025
The product of the calcination of equal parts of lead and tin 2 parts, carbonate of soda 1 part, antimonic acid 1 part, rub together, or triturate, and melt. Litharge 18 parts, sand 4 parts, oxide of antimony 2 parts, sienna earth 2 parts; melt. If it is too deep the proportion of sienna earth may be decreased. Chromate of lead 1 part, minium 3 parts.
Green oxide of chromium 1 part, flux No. 3, 3 parts, triturate and melt. Antimonic acid 2 parts, subsulphate of iron 1 part, flux No. 1, 10 parts; melt and pour out. The subsulphate of iron may be increased a little, the proportions of flux vary. Litharge 18 parts, sand 6 parts.
The proportions of the blue and yellow vary. Antimonic acid, 2 parts; sulphate of iron 1 part; flux No. 1, 9 parts. This colour is melted and sometimes a little Naples Yellow is added if it is too soft, i.e., melts too easily.
Oxide of copper, 1 part; antimonic acid, 10 parts; flux No. 1, 30 parts; pulverize together, and melt. Green oxide of chromium, 1 part; oxide of cobalt, 2 parts; triturate, and melt at a high heat. The product is a button slightly melted, from which is removed the portion in contact with the crucible. This button is pounded up, and three parts of flux No. 3, for one of the button, are added to it.
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