The question of "dualism" isn't even a real question. Science tells us that a certain wavelength of light will appear to us as green. But what really is the point of knowing that? Well, it gives us a set of instructions for how to make us experience green. But the instructions for how to produce the subjective experience are not themselves the experience. The notion that if we could just figure out how to make people experience green through some manipulation we will have learned something amazing is silly. We can already do that by showing a green flag or telling someone not to think of a green rabbit.