Colours on the fidget spinner

 

I was handed this fidget spinner and found that it was more fun to spin the middle - the bit you hold with your fingers. When spun fast, this is what you see

The colours almost mix to make white. The spiral design is interesting because it should mean that every radius has the same mix of colours.

As it slows down, the colour spiral re-emerges but this time as continuous colours, not as the discrete blobs you see when it is stationary. This must be due to the persistence of vision phenomenon - the time delay for rod and cone cells to refresh.