Here's an in-between case, that occurs very often.

My light combined with my shader has resulted in some hyper colors and some ordinary colors. So we see some yellow in the brightest parts (those facing the light).

Somebody who has no clue about the math of the Diffuse calculation and the impact of hyper colors might start theorizing that the Diffuse node can actually shift your hues. It cannot. The hue shift is because you are not seeing what is there.

But if I tell you up front that the math is simple multiplication, and you look through that, then you'd know without even testing it that hue shifting is impossible. So if you saw any, you'd check for hypercolors right away. You'd then adjust your Diffuse_Value immediately, without any faffing about.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)