I did send you the stuff to understand it better, it's all in there (at least, I tried). Comments welcome.

Anyway. If the light has color RGB = (80%, 60%, 40%) and the surface has color RGB = ( 70%, 50%, 30%) then the result is RGB = ( 80%x70%, 60%x50%, 40%x30% ) = (56%, 30%, 12% ). It's actually called filtering, like you're looking through a colored semi transparent piece of plastic.

In real life, metals do look red (eg copper) because there is more red light reflected than green and blue light. Flowers do look red because all light is absorbed and then rediffused, and in that process the red light is absorbed least. Objects do "emit" from diffusion, reflection, translution, fluorescense and phosphorescense behaviour (and because or transparancy which lets light shine through from the backside). 

Poser only handles surfaces, it hardly deals with volumes. So there is no such thing as an "inside color". But when the camera looks at an object, the edges it sees are outside, and everything between the edges is inside.

have fun.

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Usually I'm wrong. But to be effective and efficient, I don't need to be correct or accurate.

visit www.aRtBeeWeb.nl (works) or Missing Manuals (tutorials & reviews) - both need an update though