Final answer:
Fauvists got their name because they used unnatural colors in creating their works, defying the standards of academic painting and offending the sensibilities of viewers.
Step-by-step explanation:
The artists who used unnatural colors in their works are called Fauvists. Fauvism was an art movement that emerged in the early 20th century in France. Artists such as Henri Matisse and André Derain were part of this movement and they used bold, vibrant, and unnatural colors to express emotions and distort forms for expressive effect.
In their compositions, Fauvists emphasized geometric forms and used arbitrary colors that were not realistic. They rejected the traditional pastel palette used by the Impressionists and instead used a bold set of colors that were fragmented into blocks. The use of unnatural colors and the rough application of paint gave their works an energetic and celebratory feeling.
Overall, Fauvists got their name because they used unnatural colors in creating their works, defying the standards of academic painting and offending the sensibilities of viewers.