Please read the documentation first:
http://www.povray.org/documentation/view/187/

When adding the fresnel keyword, the Fresnel reflectivity function is used
instead of standard reflection. It calculates reflectivity using the
finish's IOR. So with a fresnel reflection_type an interior { ior IOR }
statement is required, even with opaque pigments. Remember that in real life
many opaque objects have a thin layer of transparent glaze on their surface,
and it is the glaze (which -does- have an IOR) that is reflective.

Bye,
Rene
--
Rene Schwietzke
r.schwietzke<at>reneschwietzke.de
http://www.rene-schwietzke.de/

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