Mistyfuse Ultraviolet is specially formulated with an effective retardant to protect against the darkening/tanning effect of UV rays. (In accelerated aging studies, exposure to UV rays have been shown to cause fusibles to darken.) Especially on light colors, sheers or light weight fabrics, and surface use, tanning may read as a color shift or dark spots.) Mistyfuse Ultraviolet is white in the package and fuses clear. Use paper-less Mistyfuse® for all weights of fabric from velvets and cottons to delicate tulles and organzas. It's a dream to work with -- Mistyfuse handles well, is incredibly sheer, doesn't add bulk and bonds firmly once cooled. Since there is no added adhesive, it will never gum up your scissors or quilting needles. Each package comes with simple instructions for easy fusing with no waste. Ideal for use on paper too! Size: 20 x 10 yards.