Silk Noil, also known as Bourette, is produced from cocoons that remain after the silk moth has hatched. As a result the fibres are short, giving a chunky "cottony" look to the woven fabric. There may be flecks of darker material in the fabric. This is keratin - a natural gum produced by the silkworm - and is a normal characteristic of these interesting fabrics. The short length of the fibres means that noil fabrics tend to dye to more muted shades than filamanent silks.