What is lampworking?
Lampworking is a type of glasswork that uses a torch to melt and shape glass. Once the glass is heated to a molten state, it is formed by blowing and shaping with tools and hand movements. It is also known as flameworking.
Lampworking vs flameworking
Essentially, flameworking and lampworking are the same. “It is more a matter of terminology,” Ralph McCaskey, Glass Flameworking Department Co-Head, told us. The term lampworking originated from when Venetian glassworkers used an oil lamp to heat their glass over. Flameworking is a more modern take on the term. Present-day glass artists primarily work with an oxygen-propane torch.
History of lampworking
Traditional glass beads, with the exception of Asian and African glasswork, hail from the Venitian Renaissance in Italy. It is believed that the oldest known glass beads date back to the fifth century BC. Lampworking became widely practiced in Murano, Italy in the 14th century. Murano was the glass bead capital of the world for over 400 years. Traditional bead makers used an oil lamp to heat their glass, which is where the technique gets its name.
Traditional oil lamps in Venice were essentially a reservoir with a wick and a small tube made from rubbered or tarred fabric. Bellows under the workbench were controlled with their feet as they worked, pumping oxygen into the oil lamp. The oxygen ensured that oil vapors burned more efficiently and directed the flame.
About thirty years ago, American artists began exploring modern glass lampworking techniques. This group eventually formed the basis for the International Society of Glass Beadmakers, an organization dedicated to the preservation of traditional techniques and promotion of educational initiatives.
There are many different techniques that you can employ at the torch when you begin lampworking. Here, we will cover everything from the absolute essentials like a lamp-wounding, to ornamental skills like marvering.
Technique 1: Hollow work
Hollow work is used to create vessels, hollow beads, and other forms. There are two ways to approach hollow work when flameworking. You can either start with hollow tubing and heat to reshape it into your desired form, or make a small steel blowpipe and build the neck of the vessel right on the tube with a hot gather of glass.
Technique 2: Lamp-wound work
The lamp-wound or bead-wound technique is essentially creating a bead by winding the glass around a mandrel, using heat from the torch and gravity. Bring your glass up to a temperature high enough to make it workable and wind it around a mandrel that has been coated in bead release. Many glass artists also work off the mandrel, holding the glass rods themselves and heating the tip until it is workable. The first marbles that students make in The Crucible’s Glass Flameworking I are known as “gravity marbles.” Students simply use a torch to heat their glass and gravity to keep the glass moving and shape a marble.
Technique 3: Marvering
Marvering is a technique of shaping your glass while it is hot by manipulating it with various tools made from graphite, wood, stainless steel, brass, tungsten, or marble tools, and paddles. While your glass is still hot, or after reheating, you can decorate the surface with stringers. The term originates from the French word “marbrer” which translates to “marble”.
Technique 4: Casting
Glass can be cast by simply pressing it into a mold in its molten state. The Bohemian glass industry was known for its ability to copy more expensive beads and produced mass-produced molded glass.
Technique 5: Pulling a Stringer
Stringers are essentially threads of glass that are pulled over the flame of your torch from re-melted sheet glass. First, warm up your glass over the torch to make a gather at the end of the rod. When your gather is hot, use needle-nose pliers or tweezers to pull the gather out into a stringer. Start by pulling slowly, and as it cools pull faster. You can also adjust the width of your stringer by how fast or slowly you pull.
Technique 6: “End of Day Bead”
Venitian bead makers would end the day with shrapnel and glass frit all over their workbench. At the end of their workday, they would clean up their bench by heating up some inexpensive glass and rolling it over the frit on their bench. This would melt it all together, creating a perfectly unique and colorful bead known as the “End of day bead.”
7 steps to lampworking
Before you go to use the torch, make a plan for your project, and have an understanding of what steps will come next. When working with glass, you need to work quickly while the glass is hot. At The Crucible, we have our students write down (or draw) the steps of their project on a small whiteboard to reference while they are working on the torch. Sketching out the steps of your projects will ensure greater success. Do not write out the steps of your project on anything flammable, like paper!
Step 1: Prepare the mandrel
Start by dipping a mandrel into a release agent so that the molten glass does not fuse directly to the metal mandrel. Release agents are either clay-based or man-made, such as boron nitride.
Step 2: Heat the rod and mandrel
Selects rods of glass to heat in the torch flame. When both your glass and the mandrel start to glow, begin rotating the mandrel. Make sure that you slowly introduce your glass to the flame. If you introduce your glass too quickly, it may shatter.
Step 3: Shape the glass
Shape your glass using a combination of heat, gravity, and tools. One of the arts of glass flameworking is keeping the glass hot enough to shape, but cool enough that you can keep it under control. As you develop your skills, you will better understand how hot your glass needs to be when manipulating it with different tools.
Step 4: Decorate the glass
Create dots or lines by melting stringers or fibers of glass on the surface. Use tools to create varying textures. Apply metal oxides such as copper, silver, gold, palladium, and platinum. You can also add color and decorations to the glass before shaping, if you would like your colors and designs to be more melded with the shape.
Step 5: Striking
If you use silver-based pigments, you can form crystals on the glass using a striking technique. Heat the bead slightly above what flameworkers call the “striking range,” which is the glass’ stress relief point, and watch the pigment precipitate and crystals develop. If you get the glass too hot, the crystal will return to invisibility, but you can still cool it back down and start over.
Step 6: Annealing
Once you have finished shaping and decorating your glass, it is time to anneal in the kiln. Annealing is the process of slowly cooling down your glass until the piece reaches its “stress relief point” to avoid thermal shock. The temperature of the kiln will depend on the type of glass. Soft glass is held at 940-970 degrees Fahrenheit and Borosilicate glass is held at 1050 degrees Fahrenheit. The kiln is cooled down at 1 or 2 degrees a minute, so the annealing process generally takes all night. You will remove your glass when they are around room temperature. When working with very small beads or glass sculptures, it may not be necessary to anneal your glass. But anything larger than an inch should be put in an annealing kiln to ensure it does not crack.
Step 7: Cold working
Now that your bead is cooled, you may choose to further decorate it or remove any sharp edges left over from the flameworking process. This is also a good time to remove any remaining bead release from the inside of the bead. Cold working techniques include sandblasting, faceting, and polishing. You can also etch the finished piece to further customize your unique lampworked project.
Learn lampworking at The Crucible
Using the intense heat of an oxygen-propane torch, you can learn how to melt and shape borosilicate or soft glass in The Crucible’s Glass Flameworking Department. You will create beautiful and interesting pieces including beads, marbles, small sculptures, and hollow vessels. We offer a range of flameworking classes, from learning the fundamentals to more advanced bead making, for both adults and youth. If you’ve ever wanted to learn the beautiful art of flameworking, look no further, see upcoming classes here.
What can you make lampworking?
Lampworking is used to create both artwork and practical objects. Ornamental lampworking projects include beads, small sculptures, marbles, small vessels, and more. It is also used to create scientific instruments.
What kind of glass do I need for lampworking?
There are a few different types of glass used in lampworking, and your project will determine what type of glass you want to use.
Soda-lime glass is the most popular type of glass and also the original formula used in traditional Venetian glass. It is also known as “soft glass.”
Borosilicate glass is a very hard glass that requires greater heat than soft glass. It was discovered by German glassmaker Otto Schott in the late 19th century when heading boron to the soft glass formula. Pyrex is the most commonly used borosilicate glass. It is an easier glass to learn with as it stays harder during the flameworking process. For beginning students, the fluidity of soft glass can present a challenge when learning on the torch.
How are lampwork beads made?
To make lampwork beads, you will need to melt down a narrow rod of glass over a torch. When the glass is molten, you can easily wind it around your mandrel using gravity as you twist the mandrel. The hole in the bead is formed by the space taken up by the mandrel. You may choose to marver or embellish your glass using various tools. After you are happy with the decoration, you will anneal and coldwork your glass bead. Final step: String your beads and wear with pride!
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