Purple Heart: Used as limb core laminations, riser material and wedges. Blood purple in colour Bubinga: Used as limb core laminations, riser material and wedges. Reddish brown with lines of dark purple Red Elm: Used as limb core laminations, riser material and wedges. Reddish brown to dark brown with apparent veins in edge grain Black Walnut: Used as limb core laminations, riser material and wedges. Brown to dark purple in colour.