What a Kashan is.
Kashan is a small city on the edge of the central Iranian desert, and it has been weaving since the Safavid era. The Kashan composition is the classical Persian one, executed with restraint: a symmetrical central medallion with corner pendants, floating on a deep madder-red field, framed by ivory corner spandrels and a navy palmette border. Where a Tabriz impresses with precision, a Kashan persuades with balance. Nothing in a good one is restless.
It is a workshop rug through and through: drawn from a cartoon by a master designer, knotted on a cotton foundation with the asymmetric Persian knot, at densities that run from around two hundred knots per square inch on a solid antique piece to a great deal more on the finest. The pile is kork wool, the fine fleece from the neck and shoulders of mountain lambs, and that choice of fibre is what most distinguishes a Kashan from its peers.
For the full atlas entry - the knot-count ranges, the border vocabulary, the variant list, the identification checklist - see the Kashan knowledge page, which sits alongside the rest of the Persian rug types. What follows here is the part that decides what a Kashan is worth and how it must be handled.
Mohtasham - the name that changes the price.
If you have shopped for an antique Kashan you have met this word, usually attached to a number several times larger than the rug beside it. Mohtasham refers to the late-19th-century Kashan revival associated with the master weaver of that name, and among Persian city rugs it is close to a maker’s mark. It is the single attribution that most moves a Kashan’s value.
What earns it is not a pattern. Mohtasham-era pieces are recognised by material and by hand: kork fleece of a fineness and evenness that later workshops did not match, worked at high density, with dyes that have aged into depth rather than going flat, and drawing that is quieter and better resolved than ordinary workshop Kashan. The medallion sits in its field rather than filling it. Run a palm across one and the handle is almost silky, and unusually consistent from end to end.
The complication is that almost none of these rugs are signed, so the label is a judgement rather than a fact, and the market applies it freely because it pays to. A listing that says Mohtasham is telling you what the seller believes, or would like you to believe. It is worth reading as a claim to be tested, not a specification. If a rug has come to you by inheritance with the name attached, that is worth checking properly rather than assuming either way.
Our own position is simple: we give an opinion at inspection, we explain what we are reading it from, and we say plainly when a rug is a good Kashan rather than a Mohtasham. That answer costs an owner nothing and is more useful than a flattering one.
Kork wool, and what it means for your rug.
Kork is the fleece from the neck and shoulders of mountain lambs - the softest wool on the animal, and only a small fraction of any fleece. Kashan workshops built their reputation on it. It takes dye deeply, which is why an antique Kashan red reads as saturated rather than merely bright, and it carries a natural sheen that softens and improves over decades rather than dulling.
It also has a consequence owners are rarely told. Fine wool is not tough wool. A Kashan will show a walking line sooner than a coarse village rug will, and it felts more readily under heat and agitation. Set it beside the Heriz and the contrast is exact: the Heriz is knotted coarsely in dense, lanolin-rich mountain wool and was woven to be a floor, while the Kashan is knotted finely in the softest fleece available and was woven to be looked at. Both are excellent rugs. They simply ask for different lives.
In practice that means a Kashan belongs where it will be walked on with some moderation - a formal room, a dining room, a bedroom - rather than a hallway or the path between a kitchen and a back door. It means the beater bar stays off the vacuum, always. And it means the interval between proper washes matters, because grit worked down into a fine pile cuts it faster than it cuts a coarse one.
Red against ivory - the riskiest pairing there is.
Look again at the composition. A Kashan sets a deep madder red directly against an undyed ivory, along the whole outline of the medallion and around every corner spandrel. It is a beautiful arrangement and, on the washing floor, the least forgiving one in Persian weaving. If that red moves even fractionally, it does not disappear into a busy field the way it might on a tribal rug. It lands on ivory, where the eye finds it instantly, and it lands along the very line the design depends on.
Madder is a good, stable natural dye, and a well-made antique Kashan usually behaves. But stability is a property of the individual rug, not of the type. It depends on how the dye was fixed, what has been spilled on the rug since, and whether anyone has already treated it with something alkaline. Later commercial pieces with early synthetic reds are a different proposition again. This is the same failure mode we describe on Chinese rugs, which pair their own strong red with a pale field.
The practical instruction for an owner is short. Blot a spill, never rub. Cool water only, and sparingly. Nothing from the cupboard - no vinegar, no baking soda, no dish soap, and above all no stain-remover spray, all of which can set a stain or start the red moving. Then call, sooner rather than later. If a red has already run into the ivory, that is a specific craft rather than a lost cause, and it is covered in how to remove colour bleed from a rug.
How a Kashan is washed.
By hand, off the floor, in cool water, with every colour dye-tested before any water reaches the rug. On a Kashan the dye test is not a formality. Each red is tested individually, because a rug can be perfectly stable in the border and mobile in the medallion, and the answer decides how the rest of the wash proceeds. A rug that shows movement is washed cooler, faster, and with far more rinsing than one that does not.
Steam is out of the question, and so is any rotary machine. Heat felts fine kork wool quickly and irreversibly, taking the sheen that is most of what you are paying for, and hot water mobilises exactly the dye you least want moving. The reasoning is the same as for steam cleaning a Persian rug, with less margin for error than usual.
Before any water, the dry grit is dusted out from the back. Then the wash: soap matched to the fibre, cool temperature-controlled water, soil flushed out rather than scrubbed in, and a rinse thorough enough to leave nothing behind. The rug dries flat with air moving on both faces, over days rather than hours, because a fine pile drying unevenly will show it. What comes back is the depth in the madder, a clean separation between red and ivory, and the kork sheen visible again across the whole field. Our full method is on the Persian rug cleaning service, and antique pieces are handled on the gentler antique wash, calibrated to the dye chemistry of the period.
Where a Kashan wears, and what comes back.
A Kashan wears in the field, not at the edges, which is the reverse of a village rug. The fine pile thins first along whatever line the room is walked, and on older pieces the medallion outline begins to soften as the small knots at the drawing edges give way. Because the composition is symmetrical, uneven wear reads more obviously here than on a busier rug: the eye expects both halves to match and notices when they stop matching.
Sun is the second agent. Madder is rich but not immune, and a Kashan left in strong window light will lighten in the exact shape of the light, which is worse than lightening evenly. Turning the rug a hundred and eighty degrees once a year is the cheapest thing an owner can do for it, and on these rugs it makes a visible difference over a decade.
Most of it is recoverable. Thinned pile is reknotted with wool dyed to the surrounding field as it looks now, and on a fine weave that work is exacting and worth doing well - rug repair and oriental rug restoration cover how. Where sun has taken colour rather than wool, colour restoration rebuilds the depth with light-fast dyes matched to the rug as it stands. As with any antique, the judgement is knowing when to stop: a hundred-year-old Kashan should read as a hundred years old. Every piece is inspected by hand before any work begins, and we tell you honestly what a wash alone will recover and what needs the loom.