Wool is more resilient, cleans better and stays clean longer. Dead wool taken from slaughtered animals by chemicals is dry, brittle and abrasive. The colors are cloudy, light is reflected off the surface of the wool. Such rugs do not wear well and have no resilience. The preparation of the wool has much to do with the appearance of the final product.
Proper shearing guarantees the maximum length of fiber.
Then the fibers are washed, sorted, teased, fluffed and combed to be ready to be spun on a spindle or spinning wheel. After the spinning process the year can be dyed. Most rugs contain either natural or synthetic dyes. Natural dyes are made from vegetable or mineral sources. Synthetic dyes are made from either aniline or chrome.