ANSWERS: 3
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I had a blind friend who claimed she dreamed in colors. Beyond that, there is no proving it except from a the point of view of physics.
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Have the blind person ask three different people of her choosing what color something is. When they all give the same answer, that is empirical proof. http://en.wikipedia.org/wiki/Empirical_method
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This is actually close to a thought experiment in epistemology. A blind person can have a full working knowledge of color, can understand it intellectually, could even be the world's foremost expert on the color spectrum. But if you were to give this person sight, would they then understand something they did not before? If you think knowledge would be gained in this situation, then it would be logical for you to also say you can not prove the existence of color to the sightless. Personally, I agree, the blind can understand color, but they can't know color like a seeing person can.
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