On the theory and practice of art-enamelling upon metals (1899)
Cunynghame, Henry H. (Henry Hardinge), Sir, 1848-1935 · Westminster : A. Constable & Co. · leaf 164
swith lead that the lead should become reduced, espe-cially if the glass has been very finely ground. Toobviate this danger, 2 per cent, of nitrate of potashin powder may be well mixed up with it. The colour-ing matters may now be added. These consist of metallic oxides. It is not in mostcases… … THE MANUFACTURE OF ENAMEL will generally be expelled at a red heat and replacedby silicic acid. It is not desirable to use sulphates, for on fusionthe sulphur is given off, and this is apt to combinewith the lead and form sulphide of lead, a heavyblack substance. The sulphur also is apt to give…
Enamel and enameling
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