The Language of the Leather

Vegetable tanning is the oldest way to turn a raw hide into lasting leather, using tannins drawn from tree bark and other plant matter rather than the chemicals of modern chrome tanning. It is slow, often many weeks, and it rewards patience: the leather it makes is firm, full of character, and alive to age. Where chrome-tanned leather stays as it began, vegetable tanned leather darkens, softens and takes on a patina that belongs to its owner alone. Every James Aston piece is 100% vegetable tanned. It is the foundation of everything the House makes and the reason a James Aston piece is made once and carried for a lifetime.

Bridle leather takes its name from the harness and bridle trade, where leather had to survive weather, sweat and years of hard use. It is made by working waxes and oils deep into a vegetable tanned hide, a process of currying and hot stuffing, until the leather itself becomes weather resistant and develops a soft surface bloom. The James Aston Italian Bridle leather comes from one of Italy's most distinguished tanneries, in the Tuscan Leather District. Bridle is a premium designation in its own right; it is never described as full grain, because its beauty lies in the stuffed, finished surface that gives it its character.

English Bridle leather is the Walsall tradition of the same stuffed, weatherproofed leather, carrying centuries of saddlery heritage. The James Aston English Bridle leather comes from J&E Sedgwick of Walsall, England, a tannery whose name has been synonymous with bridle leather for generations. Like its Italian counterpart, it is a premium designation and is never called full grain; its distinction is the depth and finish the stuffing gives it.

Tuscany holds one of the world's great concentrations of vegetable tanning houses, a tradition guarded and passed down over centuries. The James Aston Italian leathers are drawn from this district, from one of its most distinguished tanneries. The House names the region rather than the tannery, a matter of respect for a relationship built over years.

Currying is the stage after tanning, when the leather is dressed with oils and greases worked into the fibres by hand and machine. It is what gives bridle leather its suppleness, its strength and its resistance to weather. A well curried hide bends without cracking and wears without failing, the quiet engineering beneath a beautiful surface.

Hot stuffing is the heart of bridle leather. The hide is fed a warmed blend of waxes and tallows that penetrate deep into the fibres, so that protection lives within the leather rather than sitting on its surface as a coating. The result is a leather that resists water and wear from the inside out, and that carries a soft surface bloom, the visible sign of the waxes within.

Bloom is the faint, pale film that appears on the surface of well stuffed bridle leather as the waxes within migrate outward. Far from a fault, it is a sign that the leather is properly stuffed and alive. It can be gently buffed to a sheen with a soft cloth, and it will return, a quiet conversation between the leather and its keeper over the years.

Patina is the record of a life. As vegetable tanned leather is carried, handled and exposed to light and air, it darkens, deepens and takes on a lustre that cannot be manufactured, only earned. No two pieces ever age alike, because no two lives are alike. At James Aston, patina is the whole intention: a piece is made plain and honest so that its owner may write its character upon it. It is never treated as wear or as a defect, because it is the opposite of one.

Full grain is the topmost layer of the hide with its grain intact, neither sanded nor buffed to remove marks. It is the strongest and most breathable leather, and it patinas most beautifully, because its natural surface is undisturbed. A note the House keeps with care: bridle leather, though of the highest quality, is not described as full grain, because its surface is finished through stuffing rather than left in its raw grain state. Precision of language is itself a mark of the House.

Vachetta is a fine Italian vegetable tanned leather, traditionally pale and untreated, that ages to a rich honeyed brown with light and use. Milled vachetta is tumbled to soften its hand and bring up a gentle grain. It is among the most expressive of leathers in how it patinas, beginning almost blond and writing its whole history in colour as it is carried.

Nubuck is full grain leather whose outer surface has been lightly buffed to raise a fine, velvety nap. It keeps the strength of full grain while offering a softer, warmer touch. It is more open to the elements than a smooth finish, and rewards care, deepening handsomely with age.

Palladium is a rare precious metal of the platinum family, used to finish fine hardware with a bright, silver-white lustre that resists tarnish far better than ordinary plating. On a James Aston buckle it signals restraint and quality, a finish chosen to age as gracefully as the leather it fastens.

Self-lined means a piece is backed in the same leather as its outer face, rather than with a thinner or lesser lining. It is heavier, costlier and more difficult to make, and it produces an object of complete integrity, the same honest leather whichever way it is turned. It is a quiet luxury, felt more than seen.

Chrome tanning is the industrial method that turns most of the world's leather, using chromium salts to tan a hide in a day or less rather than the weeks vegetable tanning asks. It makes a leather that is soft and uniform from the first, and that stays much as it began: it does not take a patina, and it does not carry the natural scent or the depth of a vegetable tanned hide. It has its place in the world, but not in this House. Every James Aston piece is vegetable tanned, because we make objects meant to age and improve, not to stay the same until they are discarded.

Tannins are the astringent compounds found in the bark, wood and leaves of certain trees, chestnut, oak, mimosa and quebracho among them, and they are the heart of vegetable tanning. As a hide rests in baths of ever stronger tannin over weeks, the tannins bind to its fibres and make them stable, supple and lasting. It is from these plant tannins that vegetable tanning takes both its name and its character: the warm tone, the natural scent and the honest way the leather ages. Where a chemical does the work quickly, a tannin does it slowly, and leaves something of the earth in the leather.

Top grain leather is made by taking the upper part of the hide and lightly sanding away the outermost surface to remove blemishes, then finishing it to an even face. It is a genuine and serviceable leather, more uniform and often thinner than full grain, and it is widely used in fine goods. But because its natural surface has been corrected, it does not breathe or patina in quite the same way, and it lacks the strength that the untouched grain gives. The House works in full grain and in its stuffed bridle leathers, so that what you carry keeps the true face of the hide.

Spanish full grain is a vegetable tanned leather drawn from Spain, a country with a long and respected tanning tradition. It keeps the full, unsanded grain of the hide, which gives it strength, breath and the honesty of a natural surface, and it is dressed to a firm, even temper that suits belts and structured pieces. Like all the House leathers it is vegetable tanned, so it warms and deepens with wear and takes the patina that only a true full grain can. Several James Aston pieces are cut from it, chosen for its clean grain and its lasting character.

Milling is the process of turning a finished leather in a rotating drum, sometimes for many hours, so that the hide flexes against itself and softens. The milling relaxes the leather's hand and draws up its natural grain into a soft, pebbled texture that catches the light quietly. It is a finish achieved by movement rather than coating, so the leather remains itself, only suppler and more characterful. The House uses milled leathers, in Spain and in its milled vachetta, where a softer hand and a living grain are wanted.

Embossing is the pressing of a pattern, most often a crocodile or other reptile grain, into genuine leather under heat and weight, so that the texture is held permanently in the surface. It allows the beauty of an exotic pattern on honest, vegetable tanned cowhide, without an exotic skin. The House believes in naming this plainly: where a James Aston piece carries a crocodile grain, it is a crocodile print embossed into our own leather, not the skin of a crocodile. It is a considered choice, beautiful and humane, and we would never let it be mistaken for what it is not.

The grain is the outermost surface of the hide, the side that once carried the hair, and it is the finest part of any leather. Its fibres are the tightest and strongest, and its surface carries the small, honest markings of the animal's life, the faint lines and characters that no two hides share. A leather that keeps its grain whole, as full grain and bridle do, is stronger, breathes better and ages more beautifully than one whose grain has been sanded away. To read the grain is to read the leather; the House leaves it as it is, so you may read it too.

The bend is the section of the hide that lies along the back and rump of the animal, away from the softer belly and neck. Its fibres are the densest and most even in the whole hide, which makes it the firmest, strongest and most stable leather a tannery can offer, and the least of it goes to waste in stretch. It is, by long tradition, the part reserved for the finest straps and belts, where firmness and a clean straight edge matter most. A James Aston belt is cut from this best of the hide, which is one reason it holds its form through years of wear.

The saddle stitch is the strongest seam in leatherwork, made by hand with a single length of thread and a needle at each end, each passing through every hole from opposite sides so the thread locks upon itself at every stitch. Unlike a machine's lock stitch, which is a chain that can run and unravel if broken, a saddle stitch holds fast even if a stitch is cut, because each is independent. It is slow and cannot be rushed, which is why it belongs to the finest leather goods and to the saddlery tradition that named it. It is the quiet mark of a piece made by hand to last.

A burnished edge is the mark of a finished piece. The cut edge of the leather, raw and open at first, is dressed and then rubbed briskly until the friction and warmth seal its fibres into a smooth, rounded, faintly glossy finish that resists water and wear. On a fine piece it may be built up in several passes over hours, each darkening and hardening the edge a little more. It is work that is felt more than seen, but a hand run along a well burnished edge tells you at once that nothing here was hurried.

Temper is the word a tanner uses for how firm or how soft a leather is. A firm temper stands up and holds a shape, and suits a belt or the structured wall of a bag; a soft temper drapes and folds, and suits a lining or a supple piece meant to be held. Temper is set by how the hide is tanned and dressed, and a maker chooses it as carefully as the leather itself, matching the firmness of the hide to the work it must do. When a James Aston belt sits with quiet authority and a lining lies soft against the hand, that is temper, chosen on purpose.

Skiving is the paring away of leather from the flesh side to make it thinner in the places that need it, at a folded edge, where two pieces are joined, or where a strap turns back on itself. Done well, it lets thick, honest leather bend and sit cleanly without bulk, so a seam lies flat and an edge turns crisp. Done poorly, it weakens the piece. It is one of the unseen skills that separate a considered object from a merely assembled one, and it is present in every fold and turn of a well made piece.

Solid brass means a fitting made from the metal all the way through, rather than a cheaper base metal given a thin brass colour that wears away. Brass is prized for hardware because it does not rust, it is strong, and it ages with a soft warmth of its own, gaining its own quiet patina beside the leather. Where a James Aston piece uses brass, in a Chicago screw or a fitting, it is chosen to last as long as the leather it serves and to age as gracefully, so that metal and hide grow old together.