 Notice that even on the straightforward view that the representata are the ostensible colors of physical objects, the representational theory does not presuppose color realism.  It is true that we have been using color words such as “green” to mean public properties of physical objects, and one could not (without circularity) explicate phenomenal greenness in terms of represented real-world public color and then turn around and construe the latter real physical greenness as a mere disposition to produce sensations of phenomenal greenness, or in any other way that presupposed phenomenal greenness. But one may hold an error theory of physical color, taking the colors of physical objects to be ultimately illusory, and yet maintain that physical color concepts are explanatorily and/or conceptually prior to phenomenal ones.