Colour Range Block and Zamor Spheres

[skittler]

Does anyone know how to get the colour sensor to detect (at least) six colours of Zamor Sphere?
Apart from the obvious Red/Blue/Green/Yellow, I was wondering whether it will detect Light Grey (pearly silver?) spheres using White, and detect Dark Grey spheres using Black.
If not, would Steve's Color Range code block allow those colours to easily be detected (and possibly other sphere colours too)?