 thumb|400px|denim fabric dyed with indigo and black dyes and made into a shirt. denim is a sturdy cotton warp-faced twill textile in which the weft passes under two or more warp threads. this twill weaving produces the familiar diagonal ribbing of the denim that distinguishes it from cotton duck. it is a characteristic of most indigo denim that only the warp threads are dyed, whereas the weft threads remain plain white. as a result of the warp-faced twill weaving, one side of the textile then shows the blue warp threads and the other side shows the white weft threads. this is why blue jeans are white on the inside. the indigo dyeing process, in which the core of the warp threads remain white, creates denim's fading characteristics, which are unique compared to every other textile. ==etymology and origin== the name "denim" derives from the french serge de nÃ®mes, referring to the city of nÃ®mes.in 1789 george washington toured a beverly, massachusetts factory producing machine-woven cotton denim. (massachusetts foundation for the humanities: mass moments). denim was traditionally colored blue with indigo dye to make blue jeans, although "jean" formerly denoted a different, lighter, cotton fabric. the contemporary use of the word "jean" comes from the french word for genoa, italy (gÃªnes), where the first denim trousers were made. denim has been used in the usa since the late 18th century. ==dry or raw denim==  dry or raw denim (contrasted with "washed denim") is denim that is not washed after having been dyed during production. [[file:denim fiber
Cotton Jeans Woven_fabrics