Karabagh rugs are a type of Caucasian rug woven in the southern region of the Caucasus. They feature a variety of floral and geometric designs and are woven with the Turkish knot.
The most distinguishing aspect of Caucasian Karabagh rugs is their field. Initially it was common for a Karabagh to have a vivid magenta colored field which was decided to be too strong for the Western rug market. This shade was changed by a chemical process to a dark black-brown color. Below is a photo of a Caucasian Karabagh rug that has the dark brown field. Due to the iron oxides in the dye, the pile in the field wears down faster than the rest of the rugs pile.
Sources:
(1) Jerrehian, Aram K. Jr. Oriental Rug Primer; Buying and Understanding New Oriental Rugs. Pennsylvania, Running Press, 1980. Print.
(2) Bennett, Ian. Book of Oriental Carpets and Rugs. New York, The Hamlyn Publishing Group Limited, 1972. Print.