How did fauvism painters use colour?

In the early part of the 20th century, artists such as Henri Matisse, were labeled as Fauvist painters. Fauve or Wild Beast was a term of derision coined by a journalist. Fauvists would spontaneously use two or more violently contrasting colors next to each other in order to create form. They presented an expressive effect, ignoring all color harmonies in the process. The Matisse composition of Woman With The Hat, of 1905 is an example of this.