Identifying natural wool fibers from unnatural materials for carpets and manufacturers is of particular importance. In particular, the importance of this identification is when the detection of old rug fibers is considered. To identify wool from other fibers, there are different ways that include: A- by burning so that they close a small amount of fibers to fire, natural wool versus fire has the following 1 reactions to the flame and gathers itself because it reduces moisture. It burns slowly inside the flame and melts a bit. (3) It burns slowly after you get away from the flame. Smoke gives the smell of sulfur and burnt hair. There are black greys that are easy to eat. b)