Cultivated silk is the finest of all fibers. Cultivated silk worms, Bombyx mori, eat only mulberry leaves, which contain very little tannin, so their fibers are beautifully white. It is perfect for dyeing, blending and spinning. Knitters take note: 100% silk yarn will not hold its shape well when knitted because silk fibers have very little elasticity. Consider blending silk with wool or camel down for a more "knittable" yarn, or use textured stitches and cables.