A: Melange Duvet Covers and Sheet sets are made from a unique waterless coloring method. This makes the colors rich and true, yet bleachable. The twisting of the White cotton threads with the Black or Beige bamboo threads is what creates the textured look. The fabric is also BPO safe, so retinal creams will not stain the linens. The Melange Duvet Cover and Sheet Sets are very comfy and cozy, because of the twill weave and soft feel.