Colors in Between

Quick first entry to see if I can figure out how to do it.

Colors in between

Rainbow bands come in seven colors
Or is it six?
But what of all of the shades in between?

The sky comes in two colors
Or is it three?
But what of all of the shades in between?

People come in five colors
Or is it three?
But what of all of the shades in between?

The truth comes in two colors
Or is it one?
But what of all of the shades in between?