Tor,
To bend a spoke on the wheel you rode in on, consider for a moment the "wheel" of the three primary colors. For paint, the pallete is red, yellow, and blue. For light, red, green, and blue.
Suppose you keep the color labels exactly the same and turn the wheel one full color clockwise. Suppose this is the primary color wheel as your SO sees it.
That is, suppose if you were to look through the eyes and perception of your SO you would find that what you have always called blue your SO sees as what you have always called yellow, what you have always called red your SO sees as what you have always called blue, and what you have always called yellow your SO sees as what you have always called red.
If this were the case the two of you would mix colors to arrive at the mutually agreed upon labels for any given combination color in exactly the same way but you would still be mentally interpreting the visual experience differently. The "scientific data" to which kid-A referred earlier depends on the presupposition of the existence of color as a constant as verbally communicated. That presupposition cannot be extricated from such a test until someone can literally look at the world using someone else's perspective.
The question of factuality of color is one that is limited to individual perception and science has yet to discover a way to demonstrate contrarywise. It is no doubt frustrating to scientists how easily philosophy can rip straight through all pretense at adhering to their scientific method in attempts to prove otherwise. Individual interpretation of color is a fine piece of evidence to help support assertions that valid experiential individual facts exist that cannot be substantiated through the scientific method.
It is not the eye which interprets wavelengths it is struck by; it is the mind that interprets them. Science cannot read minds.
In other words, all that was proven by the results of the test to which kid-A referred was that at the same wave lengths people identify the same color labels, the degree of agreement between the subjects' interpretted perceptions cannot yet be tested scientifically. The results seem objective, but they are based on false (or at least subjective) premises.
Respectfully,
AuldSoul