My study of COLOR

The color key is based on the kind of light. Morning light is different than afternoon light. Different seasons, and weather also. Light is constantly changing, so you have to capture light key straight away, when painting plein air. Very hard as a beginner, so that is why we just work with bands of color or shapes. A color note, is when you look at a subject, tree, block, etc. and pull one color (note) from what you are experiencing. These color notes need to hold together in a painting. We are happy at this level if we get 2-3 color notes right. Some days it is suggested to push the color notes. If it is a warm day with warm notes, we push those color notes, and the same for cool. Verticals are darker than horizontal planes. The color of the light source, impacts the color in both lights and shadows.
Squinting help you see the value and color note by blocking out the details. Simplify.
I am under the impression, as with color blindness, that some of us see color with more intensity than others. Or is it the more we study color the more we see it. I am hopeful that it is the later.
I promise to see if my studies can be scanned tomorrow. It just isn't good for the glass to put wet oil paint on it.