How salmon leather is made
Bark tannins, birch tar, and five to eight weeks in the vat. This is Russia leather — the most storied tannage in history — applied to the skin of a wild Atlantic salmon.
The leather that outlived its ship
In December 1786, the brigantine Metta Catharina von Flensburg went down in Plymouth Sound. In her hold: reindeer hides from Saint Petersburg, tanned by a method the trade called Russia leather — bark-tanned, curried with birch tar, famous across Europe for its scent and its refusal to rot.
Divers found the wreck in 1973. The hides had spent nearly two hundred years in seawater. They came up supple. Still scented. Some were dry enough to cut and sew. No one alive knew how to make leather like that — the method died in the Russian Revolution, and the recipe was never written down in full.
What survives are fragments: customs records, tannery inventories, the analysis of the recovered hides themselves. Bark liquors of willow and birch. Slow vegetable tannage. A finishing dressing of birch tar oil, which gives Russia leather its unmistakable smoky-sweet smell and much of its water resistance.
We work from those fragments. Not a reenactment — an application. The same chemistry, the same patience, applied to a skin the old Russian tanners never touched: wild Atlantic salmon.
Two centuries underwater, and the hides came up still supple, still fragrant. That is not marketing. That is a chemical fact — and it can be repeated.
What bark does to a skin
A raw skin is mostly collagen — long protein fibres that bacteria love to eat. Tanning is the art of making those fibres indigestible without making them dead. Modern industry does it in a day with chromium salts. The old way does it over weeks, with tannins.
Tannins are the bitter, astringent molecules a tree makes to defend its bark. Steep ground bark in water and you get a liquor the colour of strong tea. Lay a skin in that liquor and the tannins creep between the collagen fibres, bonding to them, displacing water, closing the structure to decay. Rush it, and the surface tans while the core stays raw. So you don't rush it. You raise the strength of the liquor slowly, vat by vat, over weeks.
Fish skin takes this beautifully. Salmon collagen is finer than mammal collagen, and the fibre weave runs in a crosshatch rather than a tangle — which is why salmon leather, thickness for thickness, out-pulls cowhide in tensile tests. The scale pockets stay open through the tannage and become the grain: a diamond lattice no two skins share.
Last comes the birch tar — the signature of the Russia method. Birch bark, heated slowly without air, weeps a dark aromatic oil. Worked into the tanned skin, it waterproofs, it preserves, and it leaves the scent that perfumers have chased for a century. Cuir de Russie is a fragrance genre because of this oil. Ours comes from the same boreal forest as the fish.
Skin to leather, step by step
Every batch is logged — bark source, liquor strengths, dates in and out. The log follows each skin into its provenance record.
Skins arrive from the fishers and processors of the Côte-Nord, fresh or brined, each one a byproduct of a fish caught for food. We flesh them by hand and grade them: only clean, whole skins go to the vats.
Scales are eased out without cutting the pockets that hold them — those pockets become the grain. Cold washes, patience, no machinery a person can't lift.
A mild alkaline bath loosens residual protein and opens the fibre structure so the tannins can enter. Then the skin is brought gently back toward neutral. The old tanners called this letting the skin breathe.
The heart of the method. Skins move through a series of vats, weakest liquor to strongest — boreal bark, ground and steeped. The skin drinks the tannin at the pace collagen allows. There is no way to hurry this that does not ruin it.
Tanned skins are oiled and dressed by hand with birch tar oil, the finishing step that defined Russia leather. Water resistance, suppleness, and the scent — smoke, resin, something like leather remembering it was a forest.
Slow drying, then staking — working the skin over a blade edge until it relaxes. Each finished skin is measured, numbered, photographed, and entered in the archive with its river, season, and batch.
Asked often, answered plainly
Is salmon leather durable?
Yes — measurably. Fish collagen runs in a crosshatched weave, so at equal thickness salmon leather has higher tensile strength than cowhide. It is used for watch straps, wallets, and shoes precisely because it takes daily wear.
Does it smell like fish?
No. The proteins and fats that carry fish odour are removed in the early stages of tannage. A finished skin smells of bark tannin and birch tar — the classic cuir de Russie scent, closer to a campfire in a forest than to anything from the sea.
What is Russia leather, exactly?
A vegetable-tanned leather made by a method perfected in Russia before 1800: slow bark-liquor tannage finished with birch tar oil. The method was lost after the Russian Revolution and is known today mostly from hides recovered from the 1786 wreck of the Metta Catharina.
Is this vegetable-tanned leather?
Yes. The tannage uses only plant tannins from boreal bark — no chromium, no aldehydes, no synthetic tanning agents. It is a fully vegetable tannage in the strict, traditional sense.
Where do the skins come from?
From the existing wild Atlantic salmon fishery on Québec's Côte-Nord. Every skin is a byproduct of a fish caught for food by local fishers. No fish is farmed or killed for its skin.
How long does one skin take?
Five to eight weeks from raw skin to finished leather, depending on thickness and season. Most of that time the skin is lying quietly in a bark liquor, which is the point.
Every finished skin is numbered and archived — river, season, batch.
See the skin archive