Create a compact disc by using two tube primitives, one for the Cd’s write layer and the other for the plastic mould or open up the same file. For the outer plastic layer, simply use a blinn shader with a low specular color and 98% transparency. For the Cd’s write layer itself, drag a new anisotropic shader into the workspace and set the color to 40% grey. Next for the specular highlights set the roughness to 0.575, fresnel index to 9.008. To give the unique multi colored highlights as usually observed in a cd, drag a gradient from the 2D textures category and map it into the anisotropic material’s specular color attribute.