The use of color can enhance the emotional impact of key scenes by creating a mood or atmosphere that resonates with the audience. For example, warm colors like red and orange can evoke feelings of passion, intensity, or urgency in a scene, while cool colors like blue and green can convey calmness, sadness, or tranquility. By strategically using color palettes, filmmakers and artists can amplify emotions, highlight important elements, and guide the viewer's emotional response to key scenes.