With changes in fashion, various innovative methods for producing denim have gradually emerged. Convention- ally, denim is a warp dyed heavy cotton fabric woven in 3/1 twill weave. Only warp is dyed using indigo dye for spe- cial fading properties. But nowadays, various types of denims have been pro- duced by using dyes such as indan- threne, reactive, sulphur, and retro by using different dyeing methods.
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