From Sand to Handle: Inside the Aurelio Foundry Process
Share
Every Aurelio handle begins not as metal, but as sand.
Sand casting is one of the oldest manufacturing methods in the world — practised in essentially the same form for over four thousand years. We use it because, despite centuries of industrial alternatives, nothing produces the subtle surface character of a well-executed sand cast. Under close inspection, you'll find the faintest texture on an Aurelio surface — a micro-topography that is the direct impression of the sand mould it was born from. This texture is what makes the patina develop so richly over time. Smooth, machined surfaces age flatly. Sand-cast surfaces age with depth.
The Process, Step by Step
Pattern Making
Every handle begins as a pattern — a precise physical model, traditionally carved in wood or resin, of the finished form. Our patterns are made in-house, by hand, to tolerances of less than half a millimetre. The pattern determines everything: the proportions, the radii of every edge, the weight of the final casting.
Mould Packing
The pattern is pressed into a specially prepared sand mixture — silica sand bonded with a small amount of clay and moisture — which is packed tightly around it in a two-part box called a flask. When the pattern is removed, it leaves a perfect negative impression: the mould.
The Pour
Molten brass — an alloy of copper and zinc, heated to approximately 900°C — is poured into the mould through a small channel called a gate. The metal fills the cavity in seconds. Then it waits.
Cooling takes between twenty minutes and two hours, depending on the mass of the piece. Rushing this stage causes internal stress in the metal. We don't rush it.
Fettling and Finishing
Once cooled, the raw casting is broken from the sand, which is then reclaimed and reused. What emerges looks rough — full of gates, vents, and surface irregularities that need to be removed. This is the fettling stage: grinding, filing, and hand-finishing each piece to its final form.
It is slow work. A single Bar Lever No.04 takes approximately four hours of hand finishing from raw casting to the point where it is ready for surface treatment. This is why our lead times are what they are. This is also why no two Aurelio handles are exactly identical.
The Surface
After fettling, the handle is either left in its natural state — unlacquered brass, ready to develop its own patina in your home — or handed to our patination team, who apply bronze finishes by hand using a controlled chemical process followed by wax sealing.
Our bronze finish is not a plating. It is not a paint or a coating. It is a surface treatment of the metal itself — a chemical patina accelerated and fixed, so that the piece arrives at your door already at the "year two" stage of natural ageing, and changes very little thereafter.
Why It Matters
We are aware that handles can be made faster, cheaper, and more uniformly by CNC machining or die casting. We have tried both. The results are technically excellent and, to our eye, completely without character.
The sand cast surface holds light differently. It holds patina differently. It holds your hand differently.
That difference is what Aurelio is built on — and it is why, three years in, a customer in Pune can write to us and say that the bronze has aged exactly as we said it would: deeper, warmer, with a patina around the thumb that no machine could have planned.
That is the foundry process. That is the handle. That is the point.
All three blogs are ready to publish to your Shopify Blog section. Add featured images from your existing product/studio photography for maximum visual impact.