Knot density

Knot density is a traditional measure for quality of handmade carpets. It refers to the number of knots per unit of surface area - typically either per square inch or per square centimeter. Number of knots per unit area is directly proportional to the quality of carpet.

For two carpets of the same age, origin, condition and design, the one with the higher number of knots will be the more valuable. Knot density is normally measured in knots per square inch (KPSI) which is simply the number of vertical knots across one inch of carpet multiplied by the number of horizontal knots in the same area. Average knot density varies between region and design. A rug could have a knot density half that of another yet still be more valuable, KPSI is only one measurement of quality and value in Persian Carpets.

Hand-tying of knots is a very labour-intensive task. An average weaver can tie almost 10,000 knots per day. More difficult patterns with an above-average knot density can only be woven by a skilful weaver, thus increasing the production costs even more.

References

Rugs and carpets

Rugs	Abadeh Afghan Ahar Alcaraz Arak Ardabil Azerbaijani Bakhtiari Bakshaish Baluch Bessarabian Bidjar Borujerd Braided Caucasian Dhurrie Flokati Heriz Isfahan Jozan Karadagh Kashan Kashmir Kerman Kilim Zanjan Shahsevan rug Kuba Kurdish Lilihan Mashhad Nain Navajo Oriental Pakistani Petate Qom Rya Sarouk Scandinavia Seraband Seychour Shiraz Sweden Tabriz Tibetan Turkmen Uzbek Julkhyr Uzbek Napramach Varamin Yürük

Carpets	Armenian Bakshaish Bellini Berber Bergama Bessarabian Bradford Caucasian Chiprovtsi Crivelli Fitted Gabbeh Hereke Karabakh Konya Kuba Holbein Lilihan Lotto Memling Milas Persian Pirot Sarouk Turkish Ushak Yomut

People	James F. Ballard Sir Francis Crossley Kurt Erdmann Arthur T. Gregorian Arshag Karagheusian Latif Karimov Julius Lessing William Morris George H. Myers Arthur Upham Pope Alois Riegl Friedrich Sarre Wilhelm von Bode Thomas Whitty Charles T. Yerkes

Places	Axminster Azerbaijan Carpet Museum Carpet Museum of Iran Dar al-Athar al-Islamyya, Kuwait Brukenthal National Museum Louvre Mevlana Museum Metropolitan Museum of Art Miho Museum Museum of Applied Arts (Budapest) Museum of Applied Arts, Vienna Museum of Islamic Art, Doha Museo Poldi Pezzoli Musée des Tissus et des Arts Décoratifs, Lyon Pergamon Museum Saint Louis Art Museum Textile Museum (Washington, D.C.) Turkish and Islamic Arts Museum Turkmen Carpet Museum Victoria and Albert Museum Wilton

Cleaning	Carpet cleaning Dry carpet cleaning Floorcloth

Fabrics	Frieze Shag

Manufacture & installation	Ghiordes knot Knot density Rubia Rug hooking Rug making Tack strip Underlay

Dyes	Natural dye Synthetic dye Madder (Rubia tinctorum) Indigofera tinctoria Carmine Cochineal Armenian cochineal Polish cochineal Coccus cacti

Manufacturers	A & M Karagheusian Axminster Carpets Brintons Carpet One Cormar Carpets Dilmaghani Savonnerie manufactory DOBAG Carpet Initiative

Carpets in culture	Eagle rug Early Anatolian Animal carpets Gul Kilim motifs Elibelinde Evil eye Tree of life Magic carpet Oriental carpets in Renaissance painting Pictorial carpet Prayer rug Red carpet Transylvanian rugs War rugs

Notable individual carpets	Ardabil Carpet Badding Rug Bahar-e Kasra Coronation Carpet

Knots

By type

Bends	Adjustable Albright special Ashley's Alpine butterfly Basket weave Beer Blood Carrick Double fisherman's Fisherman's Flemish Grief Halyard Harness Heaving line Hunter's Nail One-sided overhand Racking Sheet Shoelace Shroud Simple Simon under Single carrick Surgeon's Surgeon's loop Triple fisherman's True lover's Water Zeppelin

Binding	Boa Bottle sling Constrictor Corned beef Granny Ground-line hitch Jamming Miller's Packer's Reef Strangle Thief Transom

Climbing	Autoblock Bachmann Beer Bowline on a bight Alpine butterfly Directional figure eight Double bowline Farmer's loop Figure-eight Figure-eight loop Figure-of-nine loop Friction hitch Klemheist Munter hitch Overhand loop Prusik Trident loop Yosemite bowline

Coils & Shanks	Alpine coil Butterfly coil Over/under cable coiling Chain sinnet Sheepshank

Decorative	Carrick mat Chinese button Celtic button Diamond Fiador Friendship Ghiordes Matthew Walker Turk's head Wall and crown

Fishing (angling)	Angler's loop Arbor Bimini twist Blood Fisherman's Half blood Improved clinch Knotless Nail Palomar Snell Trilene Triple fisherman's Turle Uni

Hitches	Adjustable grip Anchor bend Axle Bachmann Bale sling Barrel Becket Blackwall Blake's Boom Buntline Cat's paw Clove Cow Distel Double overhand noose Falconer's Farrimond friction Friction hitch Garda Ground-line Half Halter Highpoint Highwayman's Hitching tie Icicle Improved clinch knot Killick Knute Lobster buoy Marlinespike Munter Ossel Pile Pipe Sailor's Snuggle Swing Taut-line Timber

Loop	Angler's Artillery loop Bale sling hitch Bowline Bumper Carrick bend loop Cossack Cowboy bowline Diamond Double bowline Dropper loop Eskimo bowline Fiador Fireman's chair Friendship knot Halter hitch Handcuff Honda Jury mast Overhand Portuguese bowline Rigid double splayed loop in the bight Slippery eight Span Spanish bowline Tom fool's Trident Triple bowline Triple crown Water bowline Yosemite bowline Zeppelin

Running (slip)	Hangman's Running bowline Running highwayman's hitch Tarbuck

Splices & splicing	Eye Fid Marlinspike Rat-tail T Western Union

Stopper	Ashley's stopper Button Double overhand Monkey's fist Overhand Stevedore

Whipping	Common Overhand knot with draw-loop Portuguese Sailmaker's West Country

Lists of knots
Related topics

Lists of knots	Bends Bindings Decorative knots Hitches (friction) Mathematical

Related topics	Chinese knotting Density History International Guild of Knot Tyers Macramé Mizuhiki Norigae Ropework Lashing Splicing Seizing Sennit

Category
WikiProject
Commons

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