An Online Artist's Coop for Artists who Paint on Location
I use a limited palette, the typical warm/cool palette, which includes cadmium yellow light, cadmium yellow medium, cadmium red light, alizarine crimson, ultramarine blue, cerulean blue and titanium white.
Each of these colors has another additional color in it. Once you can identify the color, you will have better results when mixing. Following is a list of the paint colors with the additional color each has in it, also if it is cool or warm.