Fish scale the surface, interacting only with the riblet tips, not causing any high-veloctiy flow in the valleys. Since this high velocity flow now only interacts with the riblet-tip, which is a very small surface area, the momentum transfer which causes drag is now much lower than before, thereby effectively reducing drag. Also, this reduces the cross-stream velocity fluctuations, which aids in momentum transfer too. The rough, sandpaper-like texture of shark and ray skin, coupled with its toughness, has led it to be valued as a source of rawhide leather, called shagreen. One of the many historical applications of shark shagreen was
Leather wallpaper laminates which were forced into shape with a mold, while Lincrusta is a patented composite material, and Anaglypta is a simthat were not designed to look like leather wallpaper. Rottman, Strome & Co. became a major producer based in England with manufacturing in Japan. Lutson Goudleder made the imitation leather coverings in southern France and they were also made in Poland. Structures with leather wallpaper include: Leather wallpaper Leather wallpaper is a type of wallpaper used in various styles for wall covering. It is often referred to as wrought leather. It is often gilded, painted and decorated. With the advent