For some people there seems to be something which is color that exists outside of electromagnetic radiation. As the typical question goes "Is your red my green?" I don't understand the argument though. If we look at what we mean by color the only thing we can possibly say is: "Well when my optic nerve reacts to light of this frequency I my conscientiousness perceives a thing I call green". I don't understand how you can postulate that there is something that is green-ness without going through this definition. If we call a certain frequency green and furthermore agree within reason what cultural and even emotional significance is attached to that thing then we don't have any conflict. The supposition that "your red is my green" implies some sort of supernaturalism that color is something besides the sum of the electromagnetic radiation that triggers a response to a set of neurons. Furthermore, the question is non-scientific as there is nothing that is testable and even if it was truth there are absolutely no consequences. I can see that this is an interesting subject to consider briefly, but when it was brought up in a philosophy class I am taking I was a bit confused, the rest of the class seemed to just take for granted that somehow color can be separated from the physical phenomenon. To me this seems a question that is barely worth posing. Richard Dawkins puts it well in "The God Delusion" where he says that just because we can form something as a question in our language doesn't mean that it makes any sense or deserves any sort of answer.