A few weeks ago, a customer held up his three-year-old KATAAB card case and asked, "What did you do to the edges? They still look like new." It's a question that pleases us – because it shows that the hours we invest in the edge finish remain visible. Durable leather often begins where it ends: at the cut edge.
What the workbench reveals
In the KATAAB workshop in Berlin, there is a spot where work is almost always being done: the edge station. No loud machinery, no industrial process. Just a small edge burnisher, fine sandpaper in various grits, a jar of gum arabic, and calm, steady hand movements.
The workbench smells of warm leather and beeswax. Half-finished card cases lie on the work surface, their cut edges still raw and light – almost sharp to the touch. Before a piece leaves the workshop, these edges go through several stages: beveling, sanding, sealing, polishing. What looks like a small detail from the outside is actually one of the most elaborate manual steps in the leather workshop – and at the same time, one of the most frequently omitted.
The edge finish: explained layer by layer
1. Beveling: the first intervention on the edge
When leather is cut, a vertical cut edge is created – technically correct, but still unfinished. The first step is beveling with an edge creaser: a small, sharp tool that evenly tackles the top and bottom of the leather layer and creates a gentle chamfer. This transforms the sharp 90-degree edge into a slightly rounded shape, which can later be coated more evenly and will not fray with use.
Sounds small. But it's not. If you skip this step, you will see how the edge begins to open after a few months – the leather fans out, the fibers come loose. This is not a defect in the material. It is a lack of care in processing.
2. Sanding: multiple rounds, various grits
After beveling comes sanding – always in several passes. First, coarse-grit sandpaper to smooth uneven areas and roughly shape the edge. Then finer grits to prepare a uniform, smooth surface.
For multi-layered pieces – such as a card case where outer leather and lining are connected – the edge is treated as a unit. All layers are sanded together so that the edge appears as a straight line and not as a staircase of offset layers. This requires precise cutting and even adhesive application in the preceding steps. Edge finishing reveals errors in preparation – which is why careful processing begins at every point of production.
3. Sealing and polishing: the finish that lasts
The final step is applying the sealant. At KATAAB, we use gum arabic (also called tragacanth) or beeswax, depending on the type of leather and desired finish. These natural agents penetrate the open fiber structure of the cut edge, bind the fibers together, and form a smooth, stable surface.
The application is done with a small wooden stick or sandpaper dowel, which is guided over the edge in smooth circular motions. The resulting frictional heat activates the wax or tragacanth and ensures a deep, even bond with the leather. Two to three layers are applied, each dried individually and lightly sanded in between.
The result: an edge that feels smooth, looks rounded, and becomes even more beautiful over time – through regular touch and natural patina formation. No glued-on layer of paint. No plastic varnish. Just the leather itself, compacted and smoothed.
You feel this difference the first time you touch it. And you still see it years later.
Why craftsmanship matters
The edge finish is not a marginal detail – it is an indicator of the overall quality of craftsmanship of a piece. Anyone who carefully bevels, sands, and seals the edges has also done the rest carefully: the cut, the stitch, the glue. Those who omit it usually cut corners elsewhere too.
For KATAAB, the edge finish is therefore not an optional refinement, but part of the standard. Every piece that leaves the Berlin workshop has finished edges – not because it's in the catalog, but because a piece without this step is simply not finished. Handmade leather goods that are meant to last for many years must be complete in all areas. The edge is one of these areas – and often the first where quality control begins.
The ethics behind it
For the edge finish, we exclusively use natural materials: gum arabic, beeswax, or vegetable edge paints without solvents. No polyurethane coatings, no synthetic resin varnishes. There are two reasons for this: Firstly, the natural properties of the leather are preserved – breathability, flexibility, the ability to form a patina. Secondly, these materials are biodegradable.
The vegetable-tanned leather that we source from European tanneries with a traceable supply chain goes well with natural sealants – both stem from the same tradition of artisanal handling of the material. It would be contradictory to seal carefully tanned natural leather with synthetic varnishes.
Our packaging made from recycled kraft paper and cotton bags rounds off this approach: no excessive use of materials, no plastic. A piece manufactured with such care deserves packaging that respects that.
The conversation at the workshop
It was a Tuesday afternoon when Markus, a regular customer from Prenzlauer Berg, came to the workshop with his old KATAAB card case. Three years old, used daily, visibly worn – the leather had developed a beautiful, deep patina. But he had a question: "The edges are still so clean. What did you do there?"
We showed him what was on the workbench: the sandpaper, the small wooden stick, the jar of gum arabic. Explained step by step. He listened, turned the case over, traced the edge with his finger. Then he put it on the bench and asked if we could polish the edges.
We could. Twenty minutes: a new layer of tragacanth, evenly applied, briefly polished. Afterwards, the case looked as if it had been renovated – the leather itself untouched in its patina, the edges once again closed and smooth.
What makes this moment special: Markus didn't throw the piece away because it looked old. He asked because he wanted to understand how it was made. And that is exactly the relationship with a well-made object that we wish for every KATAAB piece – an object that raises questions because it shows quality you can touch.
"I didn't expect that you could recognize so much from a leather edge. Now it's the first thing I pay attention to in every leather product."
What would you ask the maker?
We work with these hand movements daily – but not every step is immediately visible. Is there anything about leather processing that has intrigued you? How a piece is cut? Why some seams last decades? How we decide which leather hide is suitable for which product?
Write it in the comments – we will answer personally. Next week, we'll look at what really happens during personalization: the engraving process step by step and how we decide which leathers are suitable for laser engraving.
Discover handmade leather accessories from Berlin
Every KATAAB piece leaves the workshop with finished edges, careful saddle stitching, and honest materials. Discover our entire range – from slim wallets and purses to all handmade leather accessories. Personalizations are possible on most pieces: a monogram, a date, a name. For questions, write to us: info@kataabwerkstatt.de.
Frequently Asked Questions
- What is an edge finish on leather and why is it important?
- Edge finishing refers to the post-processing of the cut edges of a leather piece: beveling, sanding, and sealing the open leather fibers. It protects the edge from fraying and splitting, ensures a clean appearance, and significantly extends its lifespan. Without edge finishing, the edges of leather goods begin to fray after a few months.
- Which materials are used for edge finishing on vegetable-tanned leather?
- For vegetable-tanned leather, natural sealants such as gum arabic (tragacanth) and beeswax are particularly suitable. They penetrate the open fiber structure, bind the fibers, and form a smooth surface – without synthetic resins or solvents. KATAAB exclusively uses such natural materials that harmonize with the character of natural leather.
- Can the edges of an old leather piece be re-treated?
- Yes. For vegetable-tanned leather with a natural edge finish, an aged or slightly damaged edge can be refreshed by light re-sanding and applying gum arabic or beeswax. For severely damaged edges or glued-on synthetic resin layers, professional re-treatment is recommended.
- How can I tell if a leather goods brand performs edge finishing carefully?
- Feel the cut edges: They should be smooth, slightly rounded, and without sharp corners. With a synthetic resin finish, the edges feel hard and lacquered; with a natural finish, they are softer and integrated into the leather structure. Also pay attention to multi-layered pieces – where outer and inner leather meet, all layers should be sanded as a single unit, not as a staircase of offset layers.