Le_Forgeron schrieb:
> In fact the reflection's colour is a matrix, and the refraction's colour
> is another. (Today, refraction = coef*reflection ... known as filter)
> Transmit should remains a single number, right ?

Are you sure about this?

For diffuse reflection you're right: That one would need a matrix, to 
account for fluorescence effects. The material absorbs light, and 
re-emits the energy of it at a different wavelength in random 
directions. But do there exist any (practically relevant) effects where 
a photon loses or gains energy without being scattered quite randomly?

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