In Unity 5.0.0f4, in Linear space, objects using the Standard (Specular setup) shader seem to have a fairly strong white shine even if they use a fully black Specular with no smoothness. This does not seem to happen in Gamma space. This is an image of a simple scene containing a simple black cube with fully black specular. A directional light is positioned at an angle where the problematic shine can be seen on the cube. It seems to me that a cube with fully black albedo, specular and no smoothness should be fully black.