previous it wasn't long until murano's glassmakers were the leading citizens on the island. artisans were granted the right to wear swords and enjoyed immunity from prosecution by the notoriously high-handedvenetian state. by the late 14th century, the daughters of glassmakers were allowed to marry into venice's blue-blooded families. they were the only people in europe who knew how to make a mirror. they also developed or refined technologies such as crystalline glass, enameled glass (smalto), glass with threads of gold (aventurine), multicolored glass (millefiori), milk glass (lattimo), and imitation gemstones made of glass. their virtual monopoly on quality glass lasted for centuries.