Alter the Hue of the Secondary Colors
By varying the amount of each primary color you use, you can alter the Hue of the secondary color.
On this color wheel, which I strongly suggest you get, you can see that if you use equal parts of blue and yellow, you get “pure” green.
If you put more blue than yellow in, you get a blue green.
If you put more yellow in than blue, you get yellow green. Sap green is an example of a yellow green.
Here is a video demonstrating how mixing a little blue into red and then adding white, will make permanent rose.