What is the difference between white and yellow silk worm cocoons?
White cocoons are smooth, white and about 60-100 meters long. A yellow cocoon is short, rough, yellow and about 20-30 meters long. However, every cocoon of both types also has three parts which vary in quality and character. The silk threads of the outer part are large, short and more textured filaments. In the next part of the cocoon, the filaments are smoother and longer than the first type but not as fine as the third type which is best. However, the large, textured filaments require much more silk to weave the same length of cloth, increasing the price.
