Chevreul, M. E. (Michel Eugène). “Plate XXV: Gamme Chromatique: Bleu-Violet.” In Des Couleurs Et De Leurs Applications Aux Arts Industriels à l'Aide Des Cercles Chromatiques. Paris, France: J.-B. Baillière et fils, 1864. https://digital.sciencehistory.org/works/9s1616406.
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