Final answer:
In the painting "Mountains at Collioure," Andre Derain used color to create 'deliberate disharmonies', a technique characteristic of the Fauvist movement where vivid and unnatural colors are used to convey emotion and mood.
Step-by-step explanation:
Andre Derain utilized color in a unique way in his painting "Mountains at Collioure," utilizing what he called deliberate disharmonies. This technique was influenced by the art historical context of Post-Impressionism, which embraced the use of vivid and sometimes unnatural colors. Derain, along with other Fauves, pushed the boundaries of traditional color usage to express emotion, mood, and atmosphere.
The Fauves, including Derain, were known for their revolutionary style, characterized by bold brushstrokes and non-naturalistic, vibrant colors. Derain's use of color was not to replicate the real world, but to convey emotional resonance. Therefore, the answer to the student's question is that the artist used color to create deliberate disharmonies, which was a hallmark of his Fauvist style.