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Yellow No. 240, 12 parts; red oxide of iron, 1 part. Subsulphate of iron, calcined in a muffle until it becomes a beautiful capucine red, 1 part; flux No. 2, 3 parts; mix without melting. Yellow ochre No. 244, 10 parts; sienna earth, 1 part; triturate without melting. Subsulphate of iron, 1 part; oxide of zinc, 1 part; flux No. 2, 5 parts; triturate without melting.
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.
It is a siliciferous subsulphate of alumina and potash, a compact feldspar, with the addition of sulphuric acid completely formed in it. The waters circulating in these alumiferous rocks of volcanic origin do not, however, deposit masses of native alum, to yield which the rocks must be roasted.
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