Well even black and white could be enough ;) But seriously, I also paint with CMYK only and there are a lot of tricks to get colors you cannot create with thes

Well even black and white could be enough ;) But seriously, I also paint with CMYK only and there are a lot of tricks to get colors you cannot create with these colors alone. Like bright red. When you first paint yellow, let it dry and paint red over it (transparent) you will get some sort of light bending which makes the red brighter. Car painters do this all the time. But the author is right in a way. By creating contrast you can paint black darker then your paint is. It's all about what's going on in the mind.