By the math they know the probability field of the different colors but with very little difference if any of each probability how do you manipulate the quark to switch to any particular color? You could insert the proper gluon but that is just a wave probability as well - how to do that?
https://phys.org/news/2016-02-physicists-gluons-contribution-proton.html
Spin and Optical properties
I hadn't thought of that -
Something to look at more. Gluon may be light field in some way or influence or be influenced by a light field.