Pakistan makes its own yarn from the imported cocoons that come from China. The yarn is cultivated in areas like Orangi and Shershah in Karachi which is then sold to the weavers. The pure silk yarn, before it can be used, has to undergo treatment such as bleaching or washing (in soap) and then dyeing. In its raw state, the silk is hard due to the sericlan; therefore it has to be removed. A single filament of the silk yarn is not strong enough to be woven on its own; therefore, it needs to be twisted in order to give it strength and hold.