Here is my palette. I am going to talk about what pigments I might use to get various hot or cool notes in a landscape. These are only general statements because which notes are hot or cool is always in comparison to the other notes in the painting. This is actually a little subjective, because of that.
Progressing to the right from the white in the upper left hand corner, is first the cadmium yellow. Cadmium yellows range from cool to warm, cadmium pale, light, and lemon are cool cadmium yellow is about neutral cadmium yellow medium and deep tend to be warm. Cadmium orange is warmer still.That varies from maker to maker. So which you choose for a mixture may determine whether you are making a warm note or a cool one.
Cadmium red light is warm, cad. red medium and cad. red deep grow increasingly cool. Cadmium red deep is a cherry color and cad red light is a fire color.
Burnt sienna trends towards warm. To the left of that on my palette is cobalt violet which is warm and then Prussian which runs to the cool side. I often have cobalt blue here too, that is cool in comparison to ultramarine in mixtures.
Below my white on the left is yellow ochre which is moderately warm but not like a cadmium deep. Below that is ultramarine, it also is slightly warm. Remember this is comparatively speaking, it may sound odd that I classify a blue as warm because people generally think of blue as a cool color.
Below the ultramarine is viridian which is cool and bluish. Below that I have quinacridone red, you might have alizarin or better, synthetic alizirin permanent, which is quinacridone too. That is a cool red. That is the same deal as blue. Joe Bagadonuts thinks all reds are hot, but there are of course cool reds and this is one.
Lastly, I have ivory black. I would say it is neutral but often in mixtures it works as a cool color, again comparatively speaking. That's because if I neutralize a warm note, part of what I am doing is taking away some of its chroma and thus it's heat.
Tomorrow I will write about some mixtures hot and cool and how I might use them in relationship to the light and shadow in a landscape.