Reeling cocoons is essentially a matter of softening the sericin enough to locate the end of the filament, combining this filament with those of other cocoons, and winding off the resulting thread. As long as it has the sericin in it, it's called by various names - grege silk, gummed silk, or raw silk. It's rather stiff and springy, slightly creamy colored from the sericin, and reminds me of very fine fishing line, or hair. If the sericin is removed (usually in a solution of hot water, soap and soda) the filaments of silk become unglued from each other and are free to spread out. This is unthrown silk, or silk with no twist. Sometimes it's sold as stranded silk. When a more cohesive thread is needed, reeled silk can be twisted. Two or more twisted threads can then be combined and twisted again (or thrown) in the opposite direction to make plied thread (2 and 3 ply are most common). Reeled thread with a heavy twist is called organzine, a lighter twist is called tram. Because reeled silk is composed of VERY long filaments, it doesn't need to be twisted to hold it together. It's the presence of continuous filaments that determine whether it's reeled, NOT the presence of twist.