"Oh, thou discreetest of readers," says Benvenuto Cellini, "marvel not that I have given so much time to writing about all this," and we feel like making the same apology for devoting a whole chapter to enamel; but this branch of the goldsmith's art has so many subdivisions, that it cries for space.

The word Enamel is derived from various sources. The Greek language has contributed "maltha," to melt; the German "schmeltz," the old French "esmail," and the Italian "smalta," all meaning about the same thing, and suggesting the one quality which is inseparable from enamel of all nations and of all ages,—its fusibility. For it is always employed in a fluid state, and always must be.

Enamel is a type of glass product reduced to powder, and then melted by fervent heat into a liquid condition, which, when it has hardened, returns to its vitreous state.

Enamel has been used from very early times. The first allusion to it is by Philostratus, in the year 200 A. D., where he described the process as applied to the armour of his day. "The barbarians of the regions of the ocean," he writes, "are skilled in fusing colours on heated brass, which become as hard as stone, and render the ornament thus produced durable."

Enamels have special characteristics in different periods: in the late tenth century, of Byzantium and Germany; in the eleventh century, of Italy; while most of the later work owes its leading characteristics to the French, although it continued to be produced in the other countries.

It helps one to understand the differences and similarities in enamelled work, to observe the three general forms in which it is employed; these are, the cloisonné, the champlevé, and the painted enamel. There are many subdivisions of these classifications, but for our purpose these three will suffice.

In cloisonné, the only manner known to the Greek, Anglo-Saxon, and Celtic craftsmen, the pattern is made upon a gold ground, by little upright wire lines, like filigree, the enamel is fused into all the little compartments thus formed, each bit being one clear colour, on the principle of a mosaic. The colours were always rather clear and crude, but are the more sincere and decorative on this account, the worker recognizing frankly the limitation of the material; and the gold outline harmonizes the whole, as it does in any form of art work. A cloisonné enamel is practically a mosaic, in which the separations consist of narrow bands of metal instead of plaster. The enamel was applied in its powdered state on the gold, and then fused all together in the furnace.

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