Such spiral black and white discs when rotated reflects colors; all seven colors and bright colors which are not there. This is a common optical illusion and is still not explained.
I´m not sure to understand your experiment. Colors must be a light refraction in the surface of the plate. If you transport the disc into the dark you see colors because your receptors in your eyes are exhausted. That is a very well known experience. Look at an arbitrary pattern with high contrast then you will see the inverse signals. So it would be interesting, if you tried to find out the correlation of the seen lights in the different phases of your experiment.
I used to do this experiment often in my teens,but after searching over the net it seems that it is Ben ham's Disk which is a rotating black-and-white disk producing the illusion of color. Since i am from engineering field i am not sure about this effect. Mr. Hanno please guide.
Now I understand your experiment. In the moment I´ve no explanation, but I have heard that moving black-white pattern show interferences which mix to colors in our retina. No precise idea in the moment. Must be an interference problem with the time shifted processing of our neuronal signals. Sorry, I misunderstood your question.
Regards
It seems to be an illusory perception effect. By no means an intereference (physical) one.
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