What Is Waldglas? A Guide to Medieval Forest Glass
Sep 10, 2026
The Medieval Forest Glass That Makes Modern Drinkware Look Ordinary
Modern glass is engineered to disappear. It is perfectly clear, perfectly smooth, and perfectly identical from one piece to the next.
Waldglas is different.
Its green color comes from the same raw materials that once surrounded the glassmaker. Its shape bears the character of the hand that formed it. Raised knobs, spiraled walls, and small variations are not defects to be hidden. They are part of a drinking tradition that stretches back through medieval forests, Viking trade routes, European feasting halls, and the workshops of Bohemia.
This is glassware with evidence of how it was made—and that is exactly what makes it worth holding.
What Does Waldglas Mean?
Waldglas is German for “forest glass.” The name is not a poetic invention. It describes where much of this glass was produced.
From the late Middle Ages into the early modern period, glasshouses operated in the heavily wooded regions of Central and Northern Europe. The forest supplied two things glassmakers needed in enormous quantities: fuel for the furnace and wood ash for making potash.
Glass begins with silica, commonly obtained from sand. Silica alone requires tremendous heat to melt. Potash acted as a flux, lowering the melting temperature enough for wood-fired furnaces to do the work. Glassmakers produced it by burning hardwood—often beech—and processing the resulting ash.
The workshop therefore followed the materials. Instead of hauling endless loads of timber over poor roads, glassmakers established their furnaces near the forest itself. These were working industrial settlements built around heat, smoke, sand, wood, and skilled hands.
The result became known as forest glass.
Why Is Waldglas Green?
The color was not originally a fashionable tint selected from a sample card. It came from the glassmaker’s raw materials.
Iron oxide naturally present in the sand gave many Northern and Central European glasses a green or yellow-green cast. Because local sand, ash, furnace conditions, and technique varied, the finished color could vary too. One vessel might look olive in a dim room and almost emerald when sunlight passes through it.
That green cast is part of Waldglas’s identity. Modern manufacturers spend considerable effort removing color and variation from glass. Forest glass reminds us that earlier makers worked with the character of their materials instead of trying to erase it.
The Details Were Useful Before They Were Decorative
Historical forest glass is often decorated with spirals, ribs, trails of glass, or raised knobs known as prunts.
A prunt is a small blob of hot glass applied to the outside of a vessel. It gives the glass a distinctive profile, but it can also provide a firmer grip.
The same logic explains the spirals and textured surfaces found on some beer and feasting glasses. The decoration catches the light, but it also helps keep a substantial vessel in the drinker’s hand.
Good old objects often work this way: what looks ornamental turns out to have a job.
Eight Pieces, Eight Different Stories
The new Deutsche Optik Waldglas collection is handmade in the Czech Republic and Bohemia. These are modern drinking vessels inspired by historical forms and archaeological finds—not antiques pretending to be new.
Each one carries a different chapter of European drinking history.
The Bohemian Medieval Goblet
It is a natural place to begin a Waldglas collection if you want the unmistakable green character of forest glass in a form that is easy to display, handle, and place beside other historical piece
The 14th-Century French Goblet
There is also a fine bit of modern history attached to it: according to the maker, this is the same cup design supplied for the film Gladiator II.
That makes it an especially good choice for someone drawn to medieval history, filmmaking, or display pieces that come with a story.
The Viking Glass Cup from Birka
Standing approximately 6.7 inches tall and holding about half a liter, it has real presence.
This is the glass for a generous pour, a Viking-history collection, or a table that needs something more interesting than another identical tumbler.
The Römer IV
A Römer—or Roemer—is a traditional drinking vessel associated with wine and beer, usually recognized by its rounded bowl, sturdy foot, and prunted stem.
At approximately 5.1 inches tall with a capacity of about 3.4 ounces, this is a smaller glass with a remarkably strong silhouette. The raised prunts provide a secure place to hold it and make the vessel look different from every angle.
The Arcada Feasting Glasses
Their size makes them a strong choice for a dinner table or home bar. They feel substantial without becoming cumbersome, and a pair immediately creates a more complete presentation than a single display piece.
The Whiskey Glass Set
These are the natural choice for someone who enjoys a measured evening pour but wants glassware with more character than a conventional clear rocks glass.
The boxed pair also makes an unusually good gift for a whiskey drinker, history reader, or collector of handmade European wares.
The Rum Glass Set
Their deep green color and old-world shape suit dark rum particularly well, but they are not limited to one spirit. Use them for a favorite cordial, a small pour of wine, or a matched historical pair on the shelf.
The Half-Liter Beer Glasses
Handmade in a family glassworks and sold as a set of two, each stands approximately 5.1 inches tall and holds roughly 17 to 22 ounces.
Spirals around the vessel add visual movement and create a more secure grip. Fill one and the reason for the shape becomes immediately clear.
This is a working beer glass, not a fragile object meant to spend its life behind cabinet doors.
Which Waldglas Piece Should You Choose?
- For a compact historical display piece: Start with the Bohemian Medieval Goblet.
- For a cinematic conversation piece: Choose the 14th-Century French Goblet and its connection to Gladiator II.
- For a substantial Viking-inspired vessel: Choose the half-liter Birka Viking Glass Cup.
- For a traditional wine or tasting glass: Start with the compact, prunted Römer IV.
- For a matched pair at the table: Choose the generously sized Arcada Glasses.
- For a whiskey drinker: Give the Whiskey Glass Set in its decorative box.
- For a matched pair for spirits: Choose the compact Rum Glass Set.
- For a proper beer pour: Choose the generous Half-Liter Beer Glasses.
Why a Mixed Collection Works So Well
Modern glassware is usually sold on the promise that every piece will match. Waldglas is more interesting when the forms are allowed to differ.
A Viking cup beside a medieval goblet and a 17th-century Römer shows how European drinking vessels changed across places and centuries.
The shared green color ties the pieces together, while the different stems, walls, spirals, and prunts give each one its own identity.
There are three especially good ways to build a group:
- The Historical Timeline: Birka Viking Cup, French Medieval Goblet, and Römer IV.
- The Spirits Shelf: Whiskey Glass Set and Rum Glass Set.
- The Feasting Table: Arcada Glasses and Half-Liter Beer Glasses.
A matched set looks orderly. A carefully mixed Waldglas collection tells a story.
Can Waldglas Be Used, or Is It Just for Display?
These pieces are functional drinking glasses as well as historical replicas. That is part of their appeal.
They can sit in a cabinet, but they earn more character when brought out for a quiet whiskey, a holiday table, a gathering with friends, or a beer poured at the end of a long week.
Handmade glass deserves sensible handling. Follow the maker’s care instructions, avoid sudden temperature changes, and inspect the rim and body before use.
Hand-washing in lukewarm water is the cautious approach when you want a distinctive glass to remain part of the household for years.
Small differences in color, shape, and surface are natural in handmade work. They are not reasons to reject the glass. They are evidence that the piece did not come off an anonymous production line looking exactly like ten thousand others.
Frequently Asked Questions About Waldglas
Is Waldglas Always Green?
Historical forest glass was often greenish because of iron oxide and other impurities in locally sourced raw materials. The exact shade could vary from pale yellow-green to deeper olive tones.
Are These Glasses Antiques?
No. The Deutsche Optik pieces are newly handmade historical replicas inspired by documented European forms and finds. They provide the look and feel of historical glassware without pretending to be centuries-old originals.
What Are Prunts?
Prunts are blobs or knobs of hot glass applied to the outside of a vessel. They may be decorative, but they can also provide a firmer grip where the glass has no handle.
Where Is the Deutsche Optik Waldglas Collection Made?
The pieces are handmade in the Czech Republic and Bohemia, a region with a long and celebrated glassmaking tradition.
Glass That Refuses to Disappear
Most modern drinkware is designed to be unnoticed.
Waldglas asks you to look closer.
The green color records the character of the raw materials. The texture reveals the logic of the form. The slight variations remind you that a person—not just a machine—had a hand in making it. Even the forest remains in the name.
That is why these vessels feel equally at home in the hand and on display. They are useful objects with enough history to start a conversation, and enough character to make an ordinary pour feel like an occasion.
