The Vocabulary of Murano Glass
Discover the Language of a Seven-Century Tradition
On the island of Murano, glass is spoken like a language. The furnaces never go cold, and in the glow of the furnace, a vocabulary is passed from hand to hand, from master to apprentice, much as it was when Venice ruled the seas.
For more than seven hundred years, Murano’s glassmakers have refined a remarkable lexicon of techniques, each with its own history, purpose, and visual character. These methods shaped the Renaissance masterpieces that once astonished the courts of Europe. They still define the chandeliers, sculptures, and lighting that make Murano singular today.
Understanding these terms offers more than technical knowledge. It reveals the craftsmanship, invention, and artistic heritage behind every authentic piece. Here are a few worth knowing.
Avventurina: Capturing Light
Avventurina is glass that glitters from within. Tiny metallic crystals, traditionally of gold or copper, are suspended in the molten glass and catch the light.
Developed on Murano in the seventeenth century, the legend holds that it was discovered by accident, when copper filings fell into a crucible. Its secret has been guarded for generations, since the shimmer depends on precisely controlled temperatures and cooling. The name comes from the Italian word ventura, which means adventure and references the difficulties in manufacturing the material. This results in a mesmerizing and shimmering effect, reminiscent of a starry night sky. Avventurina adds depth and enchantment to the glass, transforming each piece into a unique and captivating work of art.
Pulegoso: Glass Filled with Air and Light
Pulegoso is glass dense with thousands of tiny bubbles, which give the surface a soft, opaque, almost cloud-like quality. Where most glassmaking pursues clarity, pulegoso celebrates the air trapped inside.
The bubbles come from gas-releasing agents introduced into the molten glass. The result is a lightness that suggests sea foam. Murano designers of the early twentieth century, Napoleone Martinuzzi among them, embraced the effect for its sculptural, modern character. The trapped bubbles create a sense of movement and vitality within the glass, akin to capturing the effervescence of a fleeting moment.
Sommerso: Layers of Color
Sommerso means “submerged,” and the name describes the effect. Layers of color are nested one within another, each encased in a thick wall of clear crystal. The colors seem to float, as if suspended in deep water.
The technique was perfected in the 1930s and reached its height at mid-century, when masters such as Flavio Poli made it the signature of Murano’s modern age. Its saturated tones and weighty, jewel-like forms remain among the most collected in the world.
Reticello: Murano’s Finest Latticework
Reticello, “little net,” is one of the most technically demanding techniques in glassmaking. Two bubbles of glass, each patterned with fine white threads, are twisted in opposite directions and fused. The threads cross to form a delicate diamond lattice, with a tiny air bubble held in every intersection.
The technique dates to the sixteenth century. A well-made reticello piece looks woven rather than blown, with a precision that rewards close looking.
Filigrana: Drawing with Glass
Filigrana is drawing in glass. Slender canes of white or colored glass are arranged and embedded in clear crystal, then drawn out into fine, flowing lines that run through the walls of the piece.
It is the parent of a whole family of techniques, among them reticello and zanfirico. The effect, a pattern that seems traced by a single hair-thin line, is among the most refined in the Murano repertoire.
Zanfirico: Twisted Elegance
Zanfirico is filigrana in motion. Threads of white and color are twisted into spiraling ribbons within clear glass, and the whole piece seems to turn even when it stands still.
Tradition ties the name to Antonio Sanquirico, a nineteenth-century Venetian collector and antiquarian who admired the style. The technique itself is far older, and it gives goblets, vases, and chandelier details a graceful, rhythmic movement.
Murrine: Patterns Built from Glass Canes
Murrine are glass mosaics in miniature. Rods of colored glass are assembled so that their cross-section forms a pattern, such as a flower, a star, or a geometric motif. The rod is stretched, cut into thin slices, and arranged and fused into a vessel or sculpture.
The idea echoes ancient Roman glassmaking, and Venetian masters revived it in the fifteenth century. Each slice is a tiny window onto a pattern built in the heart of the cane, which gives murrine its jewel-box richness.
Cristallo: The Birth of Perfect Clarity
In the middle of the fifteenth century, Angelo Barovier achieved what glassmakers had long sought: glass as clear as rock crystal. By purifying his materials and decolorizing the molten glass, he created cristallo, and Murano’s fame spread across Europe.
Clear glass could be blown thin, engraved, and gilded, and it let the light pass through unobstructed. Cristallo became the foundation for centuries of Venetian tableware and mirrors, and it still anchors the island’s most elegant lighting.
Lattimo: Venice’s White Glass
Lattimo, from latte, “milk,” is an opaque, creamy white glass. It was developed in the fifteenth century in part to imitate porcelain, which Europe could not yet produce and prized above almost everything.
Lattimo is also the quiet hero of other techniques. Its white threads are the lines that form filigrana, reticello, and zanfirico, and its soft glow lends warmth to everything it touches.
Calcedonio: Inspired by Nature
Calcedonio takes its name from chalcedony, the banded semi-precious stone. The glass imitates it with marbled swirls of earthy browns, greens, and soft blues, as though a piece of polished agate had been blown into a vessel.
Traditionally linked to the fifteenth-century experiments of the Barovier family, calcedonio is a reminder that Murano’s masters often looked to the natural world for their palette. No two pieces ever read quite the same.
Incalmo: Joining Colors in Perfect Harmony
Incalmo is a feat of timing. Two or more separately blown bubbles of different colors are joined at the rim while both are still hot, and the seam is then blown out and shaped until the sections become a single form.
The result is crisp horizontal bands of pure color, meeting at lines so clean they look drawn. Because the margin for error is so small, incalmo is often considered a measure of a master’s skill.
Battuto: Sculpting the Surface
Battuto, “beaten,” is a cold-working technique. After the glass has cooled, the surface is cut with grinding wheels into a pattern of small, overlapping facets that resembles hammered metal.
The technique is closely associated with the architect Carlo Scarpa, who explored it at Venini around 1940. Light breaks across the faceted surface and gives the glass a tactile, almost architectural presence.
Satinato: The Softness of Frosted Glass
Satinato is the hush of Murano glass. Acid-etching or fine abrasion gives the surface a velvety, frosted finish that diffuses light and softens the gleam of crystal into a quiet, pearly glow.
In lighting, satinato is especially prized, because it turns a bright, direct source into something gentle and enveloping. It is a reminder that restraint can be as beautiful as brilliance.
Foglia d’Oro: Gold Suspended in Glass
Foglia d’oro, “gold leaf,” is the island’s oldest luxury. Gold is applied to the glass, often sealed beneath a final layer of clear crystal, so that it glimmers as though suspended in the material itself.
Gold adds a warmth that no other material can match. It can turn a simple form into an heirloom.
Learning to Read the Glass
Once you know these words, a piece of Murano glass starts to speak. The faint lattice of a reticello bowl, the submerged colors of a sommerso vase, and the quiet shimmer of avventurina each tell you how and when the piece was made, and by whom.
At Jean-Marc Fray, this is how we love to look at Murano: not only as an object of beauty, but as a record of human skill. A single chandelier or sculpture may carry several of these techniques at once, each one a small act of mastery.
The vocabulary of Murano has been spoken for seven centuries, and it is still being written, one breath at a time.