Glassblowing and the patience of heat

At a rear studio in Melbourne’s Brunswick, furnace light turns Tess Marlow’s safety glasses orange. She watches a gather of glass loosen on the steel rod, leaving it still when lesser heat might let her rush. This interview with a glassblower on the discipline of waiting for the right temperature begins with a practical question: when does hot glass become workable?

Marlow judges by glow, viscosity, sound and touch rather than a single temperature reading. Her glassware records those decisions in rounded rims, soft asymmetry and surfaces that hold light. For Australian audiences, her practice offers a grounded view of slow making within a market shaped by shipping costs, seasonal demand and demand for locally crafted objects.

Across an afternoon, we discuss furnace routines, imperfect batches, material prices and collaborations with designers and performers. Marlow shows how waiting functions as active judgment under heat, pressure and time, and why those lessons can travel from a working studio to shared creative spaces.

Inside the furnace

Marlow’s main furnace is a gas-fed workhorse, while a separate kiln handles the slower, controlled cooling that follows forming. “A cone tells you when a temperature has been reached,” she says, “but it cannot tell you whether this gather is ready.” She judges the glass by the way it gathers on the rod, the clean sound of a tool entering it and the colour visible through her visor.

Her language is exact even when her process is intuitive. Temperature depends on the recipe, the mass of glass and the ambient conditions. A thick vessel holds heat differently from a thin stem; summer heat around the studio can also shorten the working window. The furnace is therefore treated as a responsive partner rather than a machine with one perfect setting.

Stage Visible cue Working decision Risk if rushed
Gathering Bright, even orange glow Build a cohesive gather on the steel rod Uneven form or trapped bubbles
Forming Glass moves smoothly and tools leave clean marks Apply pressure while it remains supple Torn surface, sharp ridges or weak joins
Annealing Glow fades through cherry red Follow the kiln’s controlled cooling schedule Internal stress and delayed cracking
Reheating Cool glass returns to a working glow Warm gradually and test the edge Clouding, burns or a lost shape

The most important choice often happens before the tool touches the glass. Marlow may close the furnace door, shift her stance or wait through another rotation to let a hot spot pass. That pause preserves the material’s character and gives her time to imagine where the piece should go next.

Reading heat without rushing

Marlow checks a pyrometer, then trusts it less than she trusts experience. The instrument can be affected by flame, background light and the changing emissivity of glass as it heats. Her reference points are visual and physical: the spread of the glow, resistance at the tool tip, the weight of the gather and the speed at which an outline settles.

She also keeps small tests outside the main batch, reheating a piece until its surface becomes forgiving. “The right heat is a usable interval, not a number on a screen,” she says. “Rushing turns a controlled material into an argument.” This discipline extends beyond the furnace, especially in an Australian summer, when ambient temperatures make cooling slower and careful scheduling more valuable.

Patience as a design method

Marlow’s pieces rarely begin with a rigid drawing. She sketches profiles and proportions, then lets heat introduce a measured irregularity: a rim that opens by a few millimetres or a wall that curves beyond the first plan. Waiting gives the material time to reveal its behaviour, and her decisions are responses rather than corrections.

That approach can feel slow beside the instant feedback of screen-based design, but Marlow values its honesty. Each object records the conditions of its making. “If I hurry, the tension stays in the piece,” she says. “The customer may not know why, but they can feel that the form is settled.” The result is glass that appears relaxed, even when its construction demanded intense concentration.

Materials, fuel and patient economics

Small studios must balance experimentation with bills for propane, electricity, freight and kiln time. Soda ash and silica are basic inputs, while cullet and colourants depend on the supplier and recipe. Marlow buys some materials through Australian suppliers and sources others through specialist distributors, so a delayed order can dictate what she can make that month.

Raw-material uncertainty also shapes rural and regional businesses beyond glass. In Malaysia, tokong rubber smallholders have joined a national protest against removal of the latex price floor, as Malaysian growers’ price fight reports. The comparison is not direct: rubber never enters Marlow’s batch. It does show how a maker’s survival can depend on predictable input prices, a tension felt by Australian studios when freight rises or a preferred colour becomes unavailable.

What Australian buyers value

At Melbourne open-studio weekends and events such as Sydney’s Finders Keepers market, Marlow meets buyers looking for useful objects with a clear sense of place. Australian-made provenance carries weight, yet the conversation is often practical: will the piece fit a small apartment, survive shipping and suit everyday rituals? Her strongest sellers combine function with evidence of the hand, such as tumblers with varied bases and vases made for narrow ledges.

The local market also has seasonal rhythms. Christmas gifting brings demand for vessels and ornaments, while wedding lists create longer lead times for one-off work. Marlow prices the hours around a piece, including reheating and annealing, rather than treating the furnace hour as the only cost. Customers who accept that lead time tend to form stronger relationships with the studio and return for commissions.

Creative work beyond the studio

Marlow has designed glass for chefs, florists and small theatre companies, discovering that a shared object can carry a performance beyond words. A narrow vessel for a solo show needed to feel ceremonial without looking like set decoration, so she tested its balance, opacity and sound with the performer before the final firing.

That interest in temporary, unexpected settings echoes the one-act events staged in city laundromats, profiled in laundromat performance pop-ups. For Marlow, an ordinary room can change how an object is noticed. In a laundromat, across a market table or during a collaborative dinner, the same piece can become part of a story that its original use never anticipated.

Practices that make waiting easier

Marlow treats patience as something a studio can support through habits, not just temperament. These routines protect attention and reduce the temptation to force a gather through a narrowing window.

Waiting becomes easier when it has a place in the workflow. Marlow fills those intervals with sketching, tool preparation and careful observation, then returns when the glass gives her a clearer signal. The discipline is not passive: it is a way of staying responsive without surrendering control.