I think you may be begging the question when you assume that there must be "actual stuff" that is forever beyond physical explanation.
I suspect that one is more likely to understand "green" by realizing that it is a word (originally, a sound) that you have come to associate with memories of visual experiences. To say something is green is to do a comparison between an aspect of the experience of it, and aspects of some of those memories of prior experiences.
I suspect that one is more likely to understand "green" by realizing that it is a word (originally, a sound) that you have come to associate with memories of visual experiences. To say something is green is to do a comparison between an aspect of the experience of it, and aspects of some of those memories of prior experiences.