Gubbio
Gubbio, in the Duchy of Urbino, is known principally by the works of Maestro Giorgio Andreoli, who seems to have monopolised the secret of the ruby and yellow metallic lustre, with which he enriched not only his own productions but put the finishing touches in lustre on the plates of Xanto and other artists from Urbino, as well as from Castel Durante. There is no doubt that the painting of the piece and the application of the metallic lustre colours were two distinct operations, and that it was painted and the colours fixed in the muffle kiln some months before it was touched with the lustre pigments, and again subjected to another baking. Giorgio was a statuary as well as a painter of maiolica, several of his sculptures in marble being yet extant.
Another painter in lustre, of the school of Mo Giorgio, has signed his pieces with the letter N., which is supposed by some to be a monogram of Vincenzio, the son of Mo Giorgio; and a painter named Perestino, of Gubbio, produced some very beautiful pieces, dated 1533 and 1536.