The art of working in niello, which led Maso Finiguerra, a sculptor and worker in gold and silver, to the invention of copper plate engraving, was very early practiced in Italy. In the 15th century, and long before, it was the practice to decorate the church and other plate with designs in niello; and also caskets, sword and dagger hilts, and various kinds of ornaments. The designs were hatched with a steel point in gold or silver, then engraved with the burin, and run in while hot, with a composition called _niello_, an Italian term derived from the Latin _nigellum_--a compound of silver, lead, copper, sulphur, and borax, used by the ancients, and easily fusible, and of a dark color. The superfluous parts of the niello were then scraped away, and the surface polished, when the engraved part appeared with all the effect of a print. Lanzi says, “this substance (nigellum) being incorporated with the silver, and the whole being polished, produced the effect of shadows, which, contrasted with the clearness of the silver, gave the entire work the appearance of a chiaro-scuro in silver.” There are many very beautiful specimens of this species of work, particularly vases, cups, and _paxes_, or images of Christ on the cross, which the people in Catholic countries kiss after service, called the kiss of peace. The most remarkable known specimen in niello, is a very curious cup, preserved in the British Museum. Its total height, including the statuette of a cherub on the top of the lid, is about three feet. It is composed of silver, and the whole, except the border and statuette, is embellished with various fanciful designs. For a long time it was the property of the noble family of van Bekerhout, who made a present of it to Calonia, the sculptor of the statue of John van Eyck, in the Academy of Arts at Bruges. The widow of this artist sold it to Mr. Henry Farrer, who afterwards disposed of it to the British Museum for the sum of £350. Remarkable as this process was, there arose out of it another incalculably more so. It became a practice for goldsmiths, who wished to preserve their designs, to take impressions of their plates with earth, over which liquid sulphur was poured, and from which, when cold, the earth was removed. But Maso Finiguerra, a goldsmith and sculptor of Florence, and a pupil of the celebrated Masaccio, about the middle of the 15th century, carried the process still further, for with a mixture of soot and oil he filled the cavities of the engraving he had made, as a preparation for niello, and by pressing damp paper upon it with a roller, obtained impressions on the paper, having, as Vasari says, “Veni vano come disegnate di penna”--all the appearance of drawings done with a pen. Finiguerra was followed by Baccio Baldini, a goldsmith of Florence, who, according to Vasari, employed the eminent artist Sandro Botticelli, to design for him.