Wasn't it Florian Siegmund who wrote:
>Is it possible to design a scene containing a "blacklight" source? What I
>mean is: I want an object (or single parts of an object) only to be visible
>when being lit by special light sources. Other parts of the scene should
>not be affected by these LS. I know that one can achieve this by using
>light groups, but the main problem I have to solve is, how do I create an
>object that becomes invisible (translucent, not black!) when the LS is
>switched off or when other objects cast shadows on it?

POV blacklights don't behave anything like that.

Lights with negative colours illuminate objects with negative pigments,
but the negative lights do affect object with conventional pigments
(they darken them) and an undarklit negative-pigment object is black,
not transparent.

-- 
Mike Williams
Gentleman of Leisure

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