Odilon Redon is one of my favourite artists. I enjoyed discovering his lithographs and works in charcoal, having only ever seen or known of his later paintings. My research shows that until the middle of the 1890's, Redon devoted himself primarily to his graphic work, engravings and drawings, and notably to the noirs : unusual and precious charcoal drawings, which he exhibited in Paris for the first time at the beginning of the 1880. He explained his discovery of charcoal in a letter published by the magazine L'Art Moderne in June 1894, under the heading "Confidences d'Artiste" (Artist's Secrets). "This everyday substance, which has no beauty of its own, aided my researches into chiaroscuro and the invisible. It is a neglected material, scorned by artists." 1. It is his use of value (or tone) in his noirs that really express the use of atmospheric tone to be studied here. In much of the work a considerable amount of dark tones can be seen ...