Venetian glass () is thought to have been made for over 1,500 years, and production has been concentrated on the Venetian island of Murano since the 13th century. Today Murano is known for its art glass, but it has a long history of innovations in glassmaking in addition to its artistic fame—and was Europe's major glassmaking center from the Middle Ages through the Renaissance. During the 15th century, Murano glassmakers created "cristallo"—which was almost transparent and considered the finest glass in the world. Murano glassmakers also developed a white-colored glass (milk glass called "lattimo") that looked like porcelain. They later became Europe's finest makers of mirrors.