EXERCISE CHECKING YOUR TEMPERATURE
The plan is to paint the portrait of an animal or person with a three-colour palette (here yellow, blue and brown), and then to paint the same, or a similar subject, with the same overall three hues, switching the colour temperature bias in the choice of yellow and blue pigments. The brown (burnt sienna in my example) stays the same for both paintings.
Individual colours have a temperature bias but in the actual painting, colour temperature becomes relative as the bias of one colour adjusts the temperature bias of another. The aim of the task is to realise that colours should always be chosen in unison, as a combination, and not chosen to match individual hues in the subject.