Silk - another protein fiber

Silk is the other protein fiber. Silk is the continuous filament extruded by bombyx mori to form the cocoon in which the larvae transforms into the adult moth. Various elementary and middle-school children have described this as gross; I find it quite fascinating. Bombyx mori are native to all continents, and their favorite food is mulberry leaves. However, the species must survive, and so the larvae will feed on almost any available foliage. The type of foliage determines the color of the cocoon, and the strength of the fiber extruded for that cocoon. Mulberry leaves make for the whitest, finest cultivated silk fiber.

Silk doesn’t felt, and should be washed in the same way as wool fibers unless the dyes used on the yarns are not color-fast. In that case you’ll want to hand wash and rinse in cool water and mild soap, finishing with a splash of vinegar in the final rinse. Hang or lie flat to dry, depending on the weight of the fabric. Silk will stretch in a looped fabric, so make large swatches and hang for a day or so before measuring.