Silk Noil is also called "bourette."  Noil yarn is made from short fibres left behind after making higher quality spun silk. Impurities (crushed pupa) are also in these fibers. 

The short fiber length results in less luster than other spun silk yarns. Noil has the strongest silk odor due to impurities in the yarn. The majority of the smell dissipates after washing, but can return again when wet. 

Yarn Name Meaning: Natural (Latin)