Cotton
Cotton rarely sits on top of an oriental rug. It is hidden inside, holding the rug in shape. What makes the fibre indispensable, when it arrived in Persia, and what you can read from the back.
#Cotton as the underlying frame
Cotton sits invisibly inside almost every knotted rug: as the warp thread tensioned lengthways through the loom, and as the weft thread that secures each row of knots crossways. This unseen construction holds the rug in shape, provides the necessary tension during knotting, and decides whether the rug will lie flat or warped after decades. In a few styles, Indian dhurries and some North African pieces, the pile too is cotton, giving a flatter, cooler look. In Persian, Turkish, and Caucasian knotted rugs, however, the pile remains almost always wool or silk.
#Why cotton in particular?
Cotton combines several properties that make it the standard solution for the foundation. It is very strong, stretches only minimally, and takes the loom's tension evenly. Compared to wool it spins more smoothly, which allows cleaner knots during weaving. It is also inexpensive, which matters given the long lengths needed for warp and weft.
#When cotton entered the oriental rug
Cotton came relatively late to the Persian knotted rug. It only became widely available in Persia from the 17th century onward; before that, knotters mostly used wool for the warp. In very old rugs, antique pieces from the 18th or early 19th century, you therefore often find an all-wool warp. These pieces are more elastic than modern knotted rugs, but also less stable in shape: the form keeps shifting over time. In the Turkish-speaking lands, cotton arrived in part even later, which is why many Anatolian rugs into the early 20th century were still made with a wool warp. Anyone trying to date a rug checks the warp material as a first step.
#What you can read from the back
Turn a rug over and you see its whole construction. On a high-quality hand-knotted piece you can make out the fine cotton warps at regular intervals. Between them sit the individual knots as tiny coloured dots, held by the cotton wefts. A coarse or uneven back, a glued-on latex layer, or a backing fabric points to machine-made goods. Look at the fringes too: on a true knotted rug they are the extension of the cotton warp and therefore inseparable from the rug. Sewn-on or glued fringes are a warning sign. In very old rugs, cotton turns brittle over time. If the warp threads feel fragile, avoid wet cleaning and have the rug assessed by a specialist before any treatment.
Keep reading
Materials for oriental rugs
Wool, silk, cotton, jute, and synthetic fibres. What sets each apart, what it suits, and how it feels.
ReadHow oriental rugs are made
How wool, silk, and natural dyes become a hand-knotted work of art — explained step by step.
ReadCare and cleaning
Vacuuming, stains, moth protection, storage: how to keep your rug beautiful for generations.
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