Rugs created in the village of Heriz, located the Iranian part of Azerbaijan, that feature rich reds, blues, greens, and yellows resonating against an ivory background. The rugs are mostly distinguished by their rectilinear designs, which often includes a large central stepped medallion or an allover design of highly stylized floral motifs; the design marks a departure from traditional Persian arabesques and scrolls. Double outlining is used on finer antique rugs, a technique in which the design of the rug is separated from the field by two lines in different colors. Older Heriz and Serapi carpets were knotted over a wool fiber warp, while carpets made later in the 19th century used cotton for the warp, weft, and fringe. Weavers in Iran and Heriz used the symmetrical Turkish, or Ghiorders, knot to produce thick pile carpets with as many as 100 knots per square inch.
