What the Leather Industry Lost When It Chose Speed Over Process
To understand what the leather industry lost, you first need to know what leather was once capable of.
In 1786, a Danish merchant ship called the Metta Catharina set sail from St. Petersburg bound for Genoa, carrying a cargo of Russian hemp and Russian leather. She never made it. Caught in a violent winter gale in the English Channel, she sank in Plymouth Sound on the night of December 10th, coming to rest thirty metres below the surface in the thick black mud of the tidal channel.
She lay there, undiscovered, for 187 years.
In 1973, divers from the Plymouth Sound Sub-Aqua Club were searching the area for an entirely different wreck when they found a ship's bell bearing the markings of the Metta Catharina and her home port of Flensburg. What they found alongside it was even more extraordinary. Hundreds of leather hide bundles, still wrapped, still intact, perfectly preserved in the anaerobic black mud. The hemp cargo had rotted completely away. The leather had not. Two centuries underwater, and the hides were still supple, still structured, and, remarkably, still carrying the powerful, unmistakable smoky aroma of birch tar and wood smoke that had defined Russian leather for centuries.
But by 1973, the leather itself was the only living reference for the craft. The Bolshevik Revolution of 1917 had obliterated the tanning craft across Russia entirely. The state nationalised the workshops, and the old-world masters were executed, imprisoned, or driven into exile. The intricate knowledge, passed by word of mouth from father to son across generations, disappeared with them. The new regime redirected the tanneries toward rapid, utilitarian military production, and the ancient recipe was lost to time. No formula, no written process, no living practitioner remained. While fragmented 18th-century European industrial journals had recorded the basic steps, no written manual could capture the unwritten sensory timings, the subtle smell of the active fermentation, or the exact touch of the damp hides required to make it. Without a living practitioner the texts were unreadable. What the divers pulled from the mud of Plymouth Sound was not just a remarkable piece of preservation, it was the only intact physical benchmark left in the world of a craft that had ceased to exist half a century earlier.
This discovery is not merely a curiosity. It is the most dramatic proof ever found of what traditional leather tanning is actually capable of, and it raises something that most luxury leather content never addresses. How did we get from leather that survives two centuries on the seabed to what is sold as premium leather today, and what did we lose along the way?
Over the course of the last century, the industry has systematically shortened preparation times, replaced natural materials with industrial substitutes, and traded process for speed. Understanding what that shift means for the leather you buy, how long it lasts, how it ages, and what it costs the environment, changes everything about how you evaluate a leather investment piece.
In a previous article on this site, I explored leather types, tanning and dyeing methods in depth, comparing how they look, feel, age and develop patina. What that article did not address is longevity and sustainability, two facets of leather quality that are rarely discussed together, and the Metta Catharina leather answers both more dramatically than any laboratory test ever could.
Traditional vs Modern Vegetable Tanning: What the Difference Actually Means
When luxury brands describe their leather as vegetable tanned, they are telling you something true but incomplete. Vegetable tanning is not a single process. It is a broad category that today covers methods so different from each other that comparing them under the same name is almost misleading.
At one end sits J. & J.F. Baker, a family tannery in Colyton, Devon, England, operating since 1862 and now in its fifth generation. Baker is Britain's last remaining traditional oak bark tannery, one of only a handful left in the world. They buy raw oak bark from local woodsmen, grind it themselves, and mix it with natural spring water in deep, cold underground pits. The hides hang completely still in these pits for twelve to fourteen months, moved by hand from weaker pits to stronger ones as the tannins slowly, passively drift into the leather through natural osmosis. No machinery. No heat. No spinning drums.
It was Baker that Hermès turned to when they decided to recreate Russian leather after acquiring a parcel of the Metta Catharina hides in the 1990s. The recreation took six years of experimentation. The result, introduced in 2017 under the name Volynka, named after a traditional Slavic bagpipe made from heavy animal skins, is the closest thing to the original Russian leather that exists today.
Why Baker and not any of the many vegetable tanneries that supply Hermès's own leather goods? Because what Baker does is categorically different from what modern vegetable tanning actually is.
Modern vegetable tanneries do not use raw tree bark. They buy industrial extracts — powders or concentrated liquids made from chestnut, quebracho or mimosa trees, produced by boiling wood under high pressure, isolating the pure tannin molecules and evaporating the liquid into a standardised chemical agent. These extracts go into giant heated spinning drums with the hides. The drums rotate for twenty-four to forty-eight hours. The process works, and it produces beautiful leather: supple, evenly dyed, perfectly suited for luxury handbags and garments. But it is not the same process. And over time, that difference becomes visible, not just in how the leather ages, but in what it costs the world to make it.
Chrome, Vegetable and Pit Tanned Leather: Why the Differences Matter
You do not need a laboratory to tell the difference between these three leathers, but the numbers behind them are just as revealing as what your hands, your eyes and your nose will tell you.
Chrome Tanned Leather: Feel, Finish and Lifespan
Pick it up and the first thing you notice is the weight, or rather the lack of it. Chrome tanned leather is light, almost fabric-like, with a softness that feels immediate and consistent from edge to edge. Bend it and it springs back instantly, with no resistance. It holds colour with extraordinary stability; the blue you bought it in will still be that exact blue in twenty years, with almost no variation. The surface behaviour, however, depends entirely on how it is finished. Mass-market chrome leather is heavily sealed with pigmented acrylic or polyurethane topcoats, meaning it cannot absorb moisture or develop a patina. On smooth variants of these coated pieces, everyday scratches cannot be buffed out; they cleanly slice through the flat paint layer and remain permanently visible. While iconic heavy textures like pebbled Caviar or ridged Epi use their deep, three-dimensional embossing to effectively camouflage scuffs and hide daily wear, the underlying reality of an industrial topcoat remains. Premium, full-grain aniline chrome leather — the kind used by elite luxury houses for iconic, slouchy handbags — is left unsealed, allowing it to breathe and develop a gentle, subtle sheen over time. In practical terms of longevity, a high-end aniline chrome bag can structurally endure for 15 to 25 years with care, but its loose, elastic fibres will eventually stretch out and fatigue much faster than vegetable-tanned alternatives. When cheap, heavily sealed variants face a lifetime of neglect, the synthetic surface finishes fail even sooner, drying out, stiffening, and beginning to crack or peel as the artificial binders break down beneath the plastic face.
Modern Drum Vegetable Tanned Leather: What It Is and How It Ages
This leather announces itself differently. It is firmer, thicker, with a slight resistance when you bend it. The surface has more texture than chrome, you can feel the grain rather than just see it. Left natural or lightly finished, it will begin to develop a patina over time, absorbing the oils from your hands and darkening at the contact points first, then gradually across the surface. This process only takes weeks or months, as the mechanical tumbling of the drums leaves the fibre pores physically flexed, highly absorbent, and open to light and oils. The colour deepens into a richer, amber version of whatever it started as. It is more reactive to moisture than chrome, which means water can leave marks if the leather is untreated, but it also means it responds well to conditioning. With careful maintenance, a modern drum-tanned investment piece easily possesses a lifespan of 30 to 50 years, developing character with age, though heavy daily stress will eventually cause its tumbled, softened fibres to stretch out of shape. Over a lifetime of neglect, it behaves much like chrome: the injected fatliquors evaporate, the surface dries and eventually cracks. It is more durable than chrome when cared for, but only marginally so if neglected. It is more rewarding if you engage with it.
Traditional Pit Tanned Leather: Why It Lasts a Century
This is where the experience becomes genuinely different. The weight is the first signal: pit tanned leather is noticeably heavier and denser than either of the above. Bend it and it resists, not rigidly but with a solidity that feels structural, like bending a piece of thick, supple wood rather than fabric. The surface is not uniform. Look closely and you will see slight variations in tone, microscopic irregularities in the grain where the unrefined bark compounds stained the hide unevenly.
The patina develops gradually over many months and years. Because the months-long passive soak leaves the fibre lattice tightly compressed and incredibly dense, the surface naturally shields itself against rapid absorption. Scratches behave differently here too — because the fibre structure is so dense and intact, minor surface marks often diminish naturally as the surrounding leather expands and shifts with use and oiling.
This is also the leather that lasts. Because the fibres were never mechanically stressed during the fourteen-month soak, traditional pit tanned leather holds its structure for eighty to a hundred years or more. It does not stretch out of shape under daily use. It does not need to be replaced within a generation.
Within this traditional realm, historic Russian leather represents an even more distinct, legendary subcategory. While standard pit tanning relies strictly on oak bark for ultimate stiffness, true Russian leather uses a unique fermentation process and a softer botanical matrix of willow and birch barks, resulting in a leather that achieves maximum density without losing its historic pliability.
And then there is the smell. Pit tanned leather has a deep, earthy, woody aroma that chrome and modern vegetable leather simply do not have: distinct from the intense, smoky punch of oil-cured Russian leather, it smells like the forest floor after rain. However, when further curried with birch tar oil in the Russian tradition, this aroma transforms into a famously rich, smoky, and unforgettable scent that can last for centuries. It does not fade. Owners of century-old pit tanned pieces report that the aroma is still present, still distinctive, still unmistakably itself.
And if neglected for decades, it can still be revived. Rub a little oil into a piece of old pit tanned leather and the fibres respond by softening, darkening, coming back to life in a way that chrome or modern vegetable leather, once truly dry, cannot. The dense, untraumatized fibre lattice built over fourteen months in the pits creates a perfectly intact structural matrix that does not simply collapse under neglect. It waits to absorb fresh conditioners and safely expand back to its original state.
Leather Tanning and Sustainability: What the Industry Does Not Tell You
In global manufacturing databases, vegetable tanning is often penalised for its inefficiency: it requires vast volumes of water over its long cycle, and commercial versions consume significant energy spinning massive automated drums for weeks on end. What these databases rarely distinguish is that "vegetable tanning" covers two entirely different processes that share a name and almost nothing else. On paper, the whole category looks like the problem, not the solution. But when you look at the reality across all three methods, those metrics invert completely.
Chrome tanning produces a highly toxic slurry of heavy metals that risks oxidising into carcinogenic chromium(VI) if mismanaged. Modern drum vegetable tanning eliminates that specific problem, but introduces its own chemical dependencies. To force tannin absorption in a short drum cycle, manufacturers add petroleum-based synthetic tanning agents, known as syntans. The warm, accelerated drum environment is prone to mould, so chemical biocides and fungicides are added to keep it stable. The heavy metals are gone. The chemical load is not. Traditional pit tanning stands entirely apart: the tanning liquor is raw bark steeped in river water, nothing else, and the wastewater that leaves the pits contains no heavy metals, no synthetic polymers and no petroleum derivatives.
The water consumption argument deserves its own scrutiny. Industrial databases penalise the fourteen-month pit cycle for its significant water use, but this metric misrepresents what actually happens. Heritage tanneries are built on riverbanks deliberately. They borrow natural river water, steep raw bark in it, and return it to the river once the solid bark debris has been filtered out for local agricultural compost. It is not an industrial drain. It is a natural cycle.
The energy picture follows the same pattern. Modern drum tanneries, whether chrome or vegetable, run continuously spinning multi-ton drums drawing substantial electricity for days at a time. Traditional pit tanning requires no motorised drums. At Baker's yard in Devon, the raw bark is ground by a water wheel powered entirely by the River Coly, which has been turning it for four centuries. The hides hang stationary in cold underground pits, moved by hand. Time and passive diffusion replace electrical energy entirely. The drying stage, which in modern tanneries requires energy-intensive electric heaters, is handled at Baker by a biomass boiler fuelled entirely by the tannery's own organic waste: the hair, fat and offcuts trimmed from the hides during preparation. The hide provides the energy to dry itself.
At the end of its life, chrome leather sealed in synthetic topcoats will sit in landfill for centuries. Modern vegetable tanning improves on this, but its synthetic finishes and syntans slow decomposition considerably. Pure pit tanned leather, free of synthetic seals and coatings, is largely biodegradable, returning cleanly to the earth.
The strongest sustainability argument for traditional pit tanning is not that it is slower or more romantic. It is that an object durable enough to last a century does not need to be replaced. The most sustainable leather is the one that never ends up in landfill at all.
To see what true traditional pit tanning actually looks like in practice, the historical process of Russian leather is the most complete example that survives. Nothing documented elsewhere comes close to its detail or its proven results.
How Russian Leather Was Made: The Full Traditional Process
The original process that produced Russian leather was long, physically brutal and technically precise. It unfolded in stages, each one essential to the leather that emerged at the end: the leather that would survive two centuries on the seabed of Plymouth Sound and still smell of birch tar when it came up.
Phase 1: Preparing the Hide
Everything began at the riverbank, in conditions that were cold, foul-smelling and exhausting. The tanners received raw cattle hides caked in coarse curing salt, stiff, dehydrated and still carrying the smell of the slaughterhouse. The first task was to bring them back to life.
The hides were submerged in river water for several days, dissolving the salt and rehydrating the fibres until the skin was soft and pliable again. Then came the lime pits. The hides were lowered into deep pits filled with water and slaked lime and left there for two to three weeks. The lime did not eat the hair away, it caused the hide to swell like a sponge, attacking the roots of the hair and the fat membranes on the inside, dissolving the chemical bond that held them to the skin. What came out of the lime pit was heavy, rubbery and slippery, with the hair and fat hanging loose and ready to be removed.
This was done on the scraping beam, a heavy, half-cylindrical log of hardwood propped at a forty-five degree angle, about the width of a man's torso. The tanner draped the wet hide over it and pinned it in place with their own body weight, leaning their thighs and stomach against the top edge. Using a large two-handled knife with a deliberately dull blade, they pushed downward along the grain side of the hide with immense pressure, scraping away the loosened hair, epidermis and spent lime in a thick, foul-smelling sludge. Then the hide was flipped. A razor-sharp blade — either the opposite edge of the same knife or a dedicated fleshing knife, curved to match the exact roundness of the beam — was used to shave away every remaining trace of fat, muscle tissue and membrane from the underside. The precision required was extraordinary: too little pressure and the rotting fat would ruin the leather from the inside; too much and the blade would slice through the dermis entirely, destroying the hide.
Once the scraping was complete, the naked hides were subjected to a rigorous, heavy rinse in fresh river water, rinsing away the residual lime from the surface and leaving behind a pristine, clean canvas.
Phase 2: The Fermentation
Western European tanners, once the hide was clean, would move it directly into the tanning pits. The Russians did not. This is where the process diverged, and where the secret to Russian leather's famous suppleness was hidden.
The clean hides were lowered into deep wooden vats filled with a warm mixture of water, crushed rye flour, oatmeal and active yeast. They stayed there for several days to a week, submerged in a thick grain slurry that fermented actively around them, bubbling and releasing a sharp, sour, beer-like aroma through the workshop.
The fermentation produced lactic and acetic acids, which did two things simultaneously. They neutralised any microscopic traces of lime still hidden deep in the core fibres that the rinse had not reached, and they caused the protein fibres of the skin to swell gently and open up, relaxing the tight collagen matrix from the inside out.
This step was the bridge between raw skin and finished leather. Because the malting pits opened the pores and relaxed the interior fibres, the willow bark tannins that came next could penetrate the hide more deeply and more evenly than they could in any Western European process. It is precisely why Russian leather achieved its contradictory quality: incredibly dense and tough, yet soft and flexible at the same time. Without the fermentation step, the tannins would only reach the outer layers, leaving a hard, brittle core. The fermented rye mash prepared the canvas.
Phase 3: The Tanning
Once the hides had been prepared and fermented, they were ready for the tanning pits. The process that followed was slow, passive, relying on a unique botanical recipe that Western European tanneries could never successfully replicate.
The hides were layered into deep pits in a sandwich pattern: a layer of hide, a layer of crushed bark, another hide, another layer of bark, and so on. The pits were filled with water. As the bark released its tannins, the water darkened into a chemical-binding tea that slowly penetrated the leather over months, the hides moved by hand from weaker pits to stronger ones as the concentration built.
What made Russian leather distinctive at this stage was the bark itself. While Western European tanners — particularly in England, where it was a legal requirement — used oak bark exclusively, tanneries in the marshy regions near St. Petersburg used willow. While other parts of the vast Russian empire used birch bark or oak depending on local forests, the St. Petersburg masters relied on the abundant local wetlands. This local willow bark produced a pale, mild tannin liquor that keeps the leather fibres remarkably soft, supple and lightweight. This is precisely why Western European tanners could never replicate Russian leather despite knowing it existed: they were legally bound to oak, which produces a heavier, stiffer result.
Further north and east into Siberia, where willow was scarce, tanners substituted the inner bast of the birch tree. And birch played a second, separate role in the process: distilled down into birch tar oil, it was applied as a finish after tanning rather than used in the pits themselves. The smoky, woody aroma that defined Russian leather and inspired Chanel's Cuir de Russie came not from the tanning bark but from this final application of birch tar.
The original formula was lost entirely in the Russian Revolution of 1917 and what Baker recovered from the Metta Catharina hides was the only surviving evidence of how it had been done.
To recreate it, Baker developed a three-bark method that did not exist as a single soup in the original historical pits but was arrived at through years of reverse-engineering the recovered hides: oak from the Lake District, willow from Somerset, and birch from France, engineered into a meticulous, multi-stage tanning and finishing process. Baker's traditional, year-long oak pit tanning provided the structural density that their ancient process excels at. A subsequent treatment of willow extract restored the hallmark suppleness of the original Russian hides, while a final curing of birch tar oil contributed its distinctive, timeless aromatic quality. Together, they produced something that had not existed for nearly a century.
Phase 4: The Finish
This is where the leather became Russian leather, distinct in colour, texture and aroma from anything produced anywhere else in the world.
It began with the deep, rich crimson red known as Krasnaya Yuft, or red Juchten leather, achieved through a three-stage dyeing process using ingredients sourced from three different continents.
Before any colour touched the hide, tanners primed the damp grain surface with a warm alum-water solution, saturating the collagen fibres with aluminium ions to create a chemical baseline.
First came red sandalwood, native to southern India and carried to St. Petersburg along Central Asian caravan routes. Boiled into a heavy dark liquid and painted into the grain side of the leather, it provided the deep, woody, reddish-brown base that saturated the core fibres and prevented the colour from ever looking pale or chalky from underneath.
Next came brazilwood, imported from the New World or its Asian relative sappanwood from Southeast Asia, combined with alum, a naturally occurring mineral salt. On its own, brazilwood yields a dull, translucent brownish-orange. Combined with alum, the aluminium ions trigger a chemical reaction that transforms it into a brilliant, punchy crimson. The alum acted as what dyers call a mordant: a chemical bridge that locks the pigment permanently into the leather's collagen fibres so it cannot wash away.
Finally came cochineal: dried and crushed insects from the New World, extraordinarily expensive and used only for the outermost surface layer. Boiled with alum, the carminic acid in the insects forms what scientists call a pigment lake: tiny insoluble crystals of intense scarlet trapped permanently within the leather's pores. Applied as a final glaze over the sandalwood and brazilwood layers, it gave Russian leather its fiery, unforgettable surface brilliance and its resistance to fading in sunlight.
Three ingredients from three different continents, combined in a tannery on the banks of the Neva, producing a colour that no single dye could achieve alone.
The Russian Leather Crosshatched Grain: The Secret Behind the Pattern
While the tanned hide was still damp, warm and saturated with dye, the craftsmen began the process that gave Russian leather its most recognisable feature. The timing was everything.
In the earliest method, the artisan wore a curved block of hardwood — often cork, oak or lignum vitae — strapped to their forearm, its underside carved with sharp parallel ridges. The leather was folded grain side to grain side, inward, and the artisan leaned their full body weight onto the block, rolling it forcefully across the fold from head to tail. The sharp ridges gripped the flesh side and forced the grain sides to press violently against each other, creasing the plump collagen fibres along their natural grain lines. Then the hide was unfolded, shaken out, refolded at a sharp diagonal angle, and boarded again. Where the two sets of lines crossed, the diamond pattern was formed.
As the 18th century gave way to the Industrial Revolution, larger tanneries replaced the hand-boarded method with heavy engraved plates and metal rollers that could press the pattern across an entire hide in seconds. But even with mechanical tools, foreign tanners attempting to copy the pattern failed. English, French and German tanneries bought identical rollers and produced leather that looked exactly right on the showroom floor. The moment it was worn in the rain, the pattern disappeared. The fibres swelled with moisture and the creases relaxed entirely, leaving smooth, warped leather behind.
The difference was not the tool. It was the timing.
Western tanners applied their plates to finished, dry, cold leather, treating the diamond pattern as a cosmetic surface stamp. The Russians applied it at the precise moment when the hide was still steaming from the dye baths, plump and saturated with warm water, alum and vegetable dye, the hide at its most receptive. At that moment, the boarding did not scratch the surface, it permanently shifted the internal cellular structure of the hide into deep, unyielding folds. The pattern was forged into the anatomy of the leather, not pressed onto its face.
Phase 5: Currying
The final step sealed it permanently. Warm birch tar oil and seal fat were worked immediately into the freshly boarded, still-damp hide. As the leather dried, the hydrophobic birch oil flooded into the newly formed valleys and crevices of the diamond pattern, coating the compressed collagen fibres like a waterproof varnish. Rain could never penetrate those compressed valleys again. The fibres could never swell back up. The pattern was locked in place for as long as the leather existed.
Which, as the divers of Plymouth Sound discovered in 1973, could be a very long time indeed.
Phase 6: The Baking and Polishing
Once the birch tar oil and seal fat had been worked into the freshly boarded hide, the leather was hung in heated drying rooms. The warmth caused the birch tar oil to melt and migrate deep into the core fibres, carrying its antiseptic and water-repellent properties all the way through the hide rather than sitting on the surface alone.
When the leather emerged from the drying rooms, the final step was purely tactile. Workers vigorously rubbed the entire surface with smooth wooden blocks, generating heat through friction and gradually building the leather up to a rich, lustrous, semi-gloss sheen. No lacquer, no synthetic coating. Just wood, pressure and time.
What came off those blocks was the finished Russian leather — dense, supple, crimson, diamond-grained and smelling of birch tar and wood smoke. Everything it needed to survive, it already had inside it.
Traditional Pit Tanning Today: What Survives and Why It Matters
Over the course of the last century, the leather industry slowly replaced time with speed, natural materials with industrial substitutes, and process with shortcut. Most buyers were never told this had happened. The price still says luxury. But the material itself is not what it was a hundred years ago.
Traditional pit tanning is not a romantic footnote. It is a categorically different material with a categorically different lifespan and a categorically different environmental footprint. It lasts a century where modern alternatives last decades. It returns clean water to the river where modern processes leave a chemical residue. It biodegrades at the end of its life where chrome and synthetic-finished leather will sit in landfill for centuries. The mass industry pushed it to the absolute margins of commerce to satisfy the demands of scale and speed, leaving it to survive only where compromise is entirely refused.
Most of what has been lost left no trace. Russian leather is the exception only because a shipwreck happened to preserve the evidence at the bottom of the sea, and because one family tannery in Devon was willing to spend six years reverse engineering it. The Volynka leather that Hermès introduced in 2017 is the closest thing to the original that exists today.
We may not be so lucky next time.
