I believe you've seized the core issue, Juan: The difference between color in theory and color in application (the former offering us guidance for the latter).
Here is a wonderful site exploring both, from a painter's perspective...
http://www.handprint.com/HP/WCL/color10.html
And don't miss the link on that page to the wonderful "Artist's Color Wheel" (although the site is written for watercolorists, the pigments used are the same as those in oils etc.)...
http://www.handprint.com/HP/WCL/wheel.html
You'll note the author's contention that value is more important than hue (both, as well as chroma, are all necessary components of color), in which he refers to the grayscale of Denman Ross.
By the way, you can find one of Mr. Ross's books at...
http://www.amazon.com/exec/obidos/AS...strokeofgenius
As for me, I must get back to my palette -- my masstones are confusing my glazetones (This color business is deeper than meets the eye)!