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Where the wavelength of the light matches or is a low multiple of the path length through the the film or layer it will re-emerge from the layer after a single reflection but where the wavelength is different to the path length it will be re-reflected within the layer
Changing your viewpoint changes the path length through the layer and this means that a different wavelength or colour of light will seem to be reflected.
wait is that the same as the butterfly wings? they seem much more complex...