Notice that no matter how intense the red of the apple, or how saturated the color of the plastic, the highlights (surface reflections of the lights) still appear white - completely unsaturated.
View the apple outside on an overcast day, when there are no highligts. Does this affect the saturation?
Crumple a piece of colored paper and compare the saturation of a part of the paper that is partially shaded with an adjacent part that is not.
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