Effetre glass

Effetre glass (pronounced [ˌɛfɛˈtrɛ] ef-ay-TRAY, Italian F3, abbreviated form of fratelli tre, "three brothers"), once known as Moretti glass, is a kind of glass used in lampworking. It is considered a medium-soft glass and is popular because of its wide range of colors and the ease with which it is molded and shaped when hot.[1] Genuine Effetre glass is made in Italy by the Effetre International Company on the island of Murano. It has a working temperature of 1,733 °F (945 °C) and a coefficient of expansion value of 104.[2][3] Effetre is a variety of soda-lime glass.


  1. Ray, Susan; Pearce, Richard (2003). The Art & Soul of Glass Beads: 17 Bead Artists Share Their Inspiration & Methods. Iola, Wisconsin: Krause. p. 9. ISBN 978-0-87349-565-3. Retrieved 15 July 2011.
  2. Codina, Charles (2005). The New Jewelry: Contemporary Materials & Techniques. Lark. p. 50. ISBN 9781579907341.
  3. Mehaffey, Louise (2011) [2008]. Glass Beads: Tips, Tools, and Techniques for Learning the Craft. Mechanicsburg, PA: Stackpole books. p. 14. ISBN 978-0-8117-0814-2.

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