Effetre glass once known as Moretti glass, is a kind of glass used in lampworking

Lampworking

Lampworking is a type of glasswork that uses a gas fueled torch to melt rods and tubes of clear and colored glass. Once in a molten state, the glass is formed by blowing and shaping with tools and hand movements. It is also known as flameworking or torchworking, as the modern practice no longer...

. 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. Genuine Effetre glass is made in Italy by the Effetre International Company on the island of Murano

Murano

Murano is a series of islands linked by bridges in the Venetian Lagoon, northern Italy. It lies about 1.5 km north of Venice and measures about across with a population of just over 5,000 . It is famous for its glass making, particularly lampworking...

 and has a coefficient of expansion value of 104. Effetre is a variety of soda-lime glass

Soda-lime glass

Soda-lime glass, also called soda-lime-silica glass, is the most prevalent type of glass, used for windowpanes, and glass containers for beverages, food, and some commodity items...

.