How could I have written about color without discussing value and intensity. NO, it is not that dollar and cents value you have to put on your work, even though it is priceless to you.
Color is bursting with energy. It can create a mood, bright and sunny or a feeling of mystery. You can have a wonderful time just playing with color and its many combinations. You could (as an exercise or just for fun) paint a subject in one color or hue but in many values.

Value controls the energy produced by color. Color in high value can create drama in your painting. Color in its lowest value can suggest tranquility. Value is controlled by light.  If we place an object so the light hits it directly, where the light hits it will be a low value.  Consequently the side not exposed to the light will be higher in value as will the cast shadows.  I took a life drawing class with Don Andrews who said to paint in the shadows first and you will have form and substance.  This also works if  you are painting a building.

A good example is Rembrandt’s “Man with a magnifying Glass”. Your eye goes from the  lowest value, the white of his collar, the shape of his face controlled by shadows, his hand, his garment, his hair, and Darkest of all and highest in value, the background.

If  You place the lightest light  of your painting beside your darkest dark, your eye will automatically go to that spot in your painting. In organizing your painting, consider about 50% of your painting will be  mid-tones.  Work upward from your lightest lights.  It is easy to increase a value but lowering a value can be very difficult.

Really study your subject so that you see value changes.

When we consider color and its properties, we consider hue, tone and chroma.  Each of the three primary colors has many hues or variations of that primary.  It has tone or darkness of hue and strength or weakness and chroma in its strength.