'With light poise and counter-poise, Nature oscillates within prescribed limits. Yet thus all arise the varieties and conditions of the phenomena which are present to us in space and time.' - Goethe
The touchstone of Newton's theory was his famous experiment with the prism. A prism breaks a beam of white light into a rainbow of colors, spread across a whole visible spectrum. Then Newton realized that must be the elementary components that add up to create white.
While Newton used the standard prism, and passed white light through it, Goethe had also run a series of experiments, with a prism again, but by just looking through the prism.
And he found everything uniform, but when his prism passed through the fold of a cloud behind the sun, he was met with a blast of color, where he stated that 'color is the interchange of light and shadow.'
Goethe's ideas resemble a facile notion, popular among psychologists, but Feigenbaum argued that his (i.e., Goethe's) statement had true science in them which emphasized the repeatability of his experiments.
It was the perception of color, to both Goethe and Feigenbaum, that was universal and objective.
So in that sense, what scientific evidence is there for the definable real world quality of redness independent our perception?