In its original cocoon form, raw silk is bumpy and irregular. Thai weavers separate the completed cocoons from the mulberry bush and soak them in a vat of boiling water to separate the silk thread from the caterpillar inside the cocoon.
The Bombyx mori usually produces silk thread of varying colors, ranging from light gold to very light green, with lengths varying from 500 to 1,500 yards per cocoon.