Millefiore enameling was widely popular in Gaul, where it was often used to decorate disk brooches and vessels. In this technique, the artist fuses together glass rods of different colors. The multicolored rods are then cut into cross sections, which are placed in a metal base and heated sufficiently for them to adhere. The result is an intricate pattern of flowers and checkerboards.
[ John J. Klejman, New York (sold 1966)]
Los Angeles County Museum of Art. "The Middle Ages: Treasures from The Cloisters and The Metropolitan Museum of Art," January 18, 1970–March 29, 1970.
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Caillet, Jean-Pierre. "Provincial Roman Objects in The Metropolitan Museum of Art." Metropolitan Museum Journal 32 (1997). p. 55, fig. 11.